I ran a tweaked 250 turbo for several years, in addition to a couple of 924S's and now an S2 track car
They are all great cars - your decision might come down to some other factors apart from the engine's power delivery.
If you like tinkering and buying shiny upgrades, then get a turbo - the possibilities are endless...
If a/c is on the list, try looking for an S2 with a/c....you might have to wait a while - even longer if you want working a/c. Whereas a/c is standard on turbos, so the chance of finding one working is much better.
Turbo interiors are usually nicer - many with leather sports seats. S2's are a bit of a mixed bunch, lots of later cars with grey & blue interiors which I didn't like. Black or Black/Linen are my personal favourites, leaving aside the wonderful Silver Rose pink check for a minute [

] The 10 speaker premium sound pack was also a nice upgrade, not on many S2's.
I never really found traction in the turbo was an issue - I'm sure the LSD helped, but you just have to respect it and not boot it in a low gear halfway round a bend. get the front wheels straight and everything's fine.
I did enjoy the mid-range torque of the turbo - lots of fun when you put your foot down, but both cars share the same basic handling / steering characteristics. Heavy wheels will affect both S2 or Turbo. The only thing that was a pain was the lack of low down power in first gear - pulling out onto a roundabout from a standstill could catch you out sometimes while you wait for the turbo to spool up.
Of course the best option would be a 300hp S2 [

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