I never collected either when I was a kid; both were too expensive. Fast forward 25 years and you can still find unopened wax for under $20 a box (what an investment that turned out to be!). Here are the pros and cons of each set...
1991 Topps Stadium Club baseball
As Topps's first foray into super premium design and materials, 1991's TSC had an undeniably great design on both front and back. It was also the first Topps baseball product to be released in more than one series in 18 years (last multi-series Topps baseball set was in 1973). There was a card of Nolan Ryan wearing a tux. For no good reason. (Collection idea: Guys in tuxedoes. There are a ton of cards depicting players in formal wear, for some reason most of them produced in 1991.) The backs featured an inset of that player's Topps rookie card. This was especially great when that player's rookie card was his 1991 Topps Stadium Club card. My 12-year-old self really loved the crap out of this ripple in the spacetime continuum. The photography is fantastic, and with full-bleed photos without borders, getting a miscut card is a really big deal (no borders mean miscuts are obvious; an excellent prospect for miscut collectors like me).
There are few drawbacks to this set. Foremost are the head-scratching data splits on the card back. Second, because the cards are basically just 25-year-old color photos, the cards stick together. Also, there are only 600 cards in the whole set, which means the last of the scrubs won't have cards. Also, there are few rookies (Bagwell, Luis Gonzalez) and no Chipper Jones.
1992-93 Topps Stadium Club basketball
I only purchased two packs on these when I was a kid, since packs were insanely expensive. Now you can buy a jumbo box of series two for $40. The photography is exquisite. The backs feature "rookie cards," which is self-defeating, since Topps did not create basketball cards from 1983 to 1991. Conversely, the actual rookies in series two are great, as the 1992 draft was hobby-defining for the 1990s: Shaq, Alonzo Mourning, Christian Laettner, Jimmy Jackson, Harold Miner, Walt Williams; even Latrell Sprewell. The checklist is robust at 400 total cards, which is especially deep for a pre-Toronto/Vancouver NBA expansion set.
And series two featured the ridiculous "Beam Team" insert, which was meant to highlight a laser-light extravaganza shown at halftimes of select NBA games and instead became the hottest insert of the early 1990s. Man, how I wanted those cards! And I don't think I ever even actually saw one in real life, just in Beckett.
The drawbacks are similar to those of the baseball set: clumped card stock, data points that make no sense to little kids, and the aforementioned non-rookie rookie cards.
So now I leave it up to you...
Let’s take a look at these sets, starting with 1990 Score. You don’t need me to tell you that the Bo Jackson football/baseball card was the biggest event card in a time when the hobby was completely awash with them. You also don’t need me to tell you that you probably had three or four of the Sandberg error, if you could remember what the error on the card was. Or how about Dream Team? Or Rookie Dream Team in the factory set? Or the fact that the Draft Picks subset was flat-out awesome, with rookies of Knoblauch, Ben McDonald, Mo Vaughn, Earl Cunningham (who?), 
Coming on the heels of one of the most iconic sets of the early decade, Topps tried to make this edition even better than the previous one. Because we’re talking about 1992, that meant adding inserts and send-away offers, not to mention opening up the checklist to seemingly include every major leaguer, and everyone they went to high school with–a whopping 900 cards in all (up from 600 in 1991). And yet even with all these base cards, and in one of the best rookie crop years to boot, there are few (if any) major rookies in the whole base checklist. 
In fact, the checklist for this set is incredibly well balanced in terms of debuting rookies. The Low Series had cards of Phil Plantier, Eric Karros, Mike Mussina and Chipper Jones, plus first cards (not rookies) of Mo Vaughn, Chuck Knoblauch and Frank Thomas giving everybody the finger. The High Series had Jeff Bagwell and Final Edition had everyone mentioned earlier. 
In 1991, when Topps debuted Stadium Club, no other set ever made had featured full-bleed color photography on every card. And yet by 1994, just three short years later, the full-bleed photo had become a sports card cliché. What had made Stadium Club the shit to rock in 1991 was keeping it down by 1994. Add a tired post-Grunge zine-style American Typewriter freeware font and faux cool ripped look on the front and ugly graphics, utterly ridiculous text treatments and nonsensical statistics on the back and you’ve got yourself a truly forgettable design. 
The funniest thing about Stadium Club circa 1993 was that their best set of the year wasn’t even produced for general hobbyist consumption, but in a specially boxed set distributed solely at Toys ‘R’ Us. The cards, despite sporting the trademark Stadium Club full-bleed photo, were flimsy, cheap, had beginner’s guide to graphic design front and back graphics and featured end-of-the-roll type photos, like this great one of Sheff striking out with a guy in a skirt in the background straddling part of the dugout, or whatever it is he’s doing back there. Plus, the cards were stamped with just enough gold foil to make them feel legit. It was a great set. I wish I could remember who was in it.