This is not a question I can seriously answer, so I wont, just cant see it, but I have to, i'll provide somewhat plausible options. It would probably be Barca or Arsenal, if one avoids Italian teams (even if Italian footie is my footie passion), big back then, but Milan dream team time wasnt to my liking, despite having a fierce Milanista of a father, also a brother and an uncle, who all tried to turn me. Cant see myself with the other italian teams even if it was the biggiest league by far and my main type of footie interest, just cant see it any probable scenario (mainly Milan as possible candidate, but as said, general aversion to them back then).
Just said Arse and Barca because those are the two I sympathize with when watching the other 2 top leagues since following footie in last 16 years, preference over the others in style and such, even if fairly neautral. English footie I cant see myself being a fan of, just cant, but mid to late 90s, prolly would been an Arsenal slowly becoming more and more un-english, Bergkamp would have made it an easy choice if it was down to a player, ridicolously classy wizard.
Barca would have been much easier choice due to the star players to draw you (generally young footie fans like a player, and then maybe that attraction may grow to fanhood), the unreal trio of Romario, Ronaldo and Rivaldo alone would sufficed, even if tons of others (Laudrup, Hagi, Stoichkov, Prosinecki, Pep etc). Even if Barca back then were a total roller coaster, teams filled with journeymen, and big chokes for several years, but still filled with kind of players to draw a first interest. I mean, Ronaldo in 96 alone, I think him alone turned insane amounts of kids to become avid footie fans with that season. Just too sick for words.