For me, the 32x would have to take the cake. I haven't had many add-ons, but of all that I've owned, the 32x trumps the Sega CD, Super Gameboy, Powerbase, master gear...I think that's all I've owned. Unless you count ram expansions for N64 and Saturn.
I'd like to take a moment & point out that anyone who thinks the Jag is better than the 32x is a bonafide d00fus. Even the not-so-great 32x games (barring Motocross Championship) are better than anything on the Jaguar, and cheaper too. Sorry for going OT, but this has been on my mind a lot lately as I keep seeing stuff about the Jaguar everywhere.
EDIT: wow, second time posting in the wrong forum/topic in the same day. I really need to stop using my phone.
It all depends on your taste, and what you want to get into. At the time, when those consoles were fresh, the 32X was of interest to me, mostly due to the Corpse Killer, Ground Zero Texas (Oops, I meant the Fahrenheit game), Night Trap 32X, etc. The full motion games. It had some fighters, too, but, the full motion stuff was of interest to me, on the 32X. However, it did not interest me much when it was new, and most other people I knew of at the time looked at the system with some interest, but not enough to buy it since the other consoles (PS, etc) were on the way.
Jaguar, it's not a bad system, it just has a different batch of games. I do not recommend a Jaguar for just anyone. I'd tell a person to study the library first. Same goes for 32X, especially since there are less games.
I would have picked up a 32X, if I caught it when it was marked down. However, during the time it was marked down on clearance, I must not have been in a Toys 'r Us. I know that's how I ended up getting a Virtual Boy, it was a no-brainer to get that when it was $20-$30 or so at TRU. I remember going there for something else, seeing the VB really cheap, and figuring, "Hey, why not!?!".