I would go with the Mazdaspeed 3, better interior, looks better IMO, and its not a Neon.
SRT-4's can be made quick real easily. Not so sure about the MS3, haven't seen or heard of any of them being heavily modded. Just like all turbo cars, im sure it can be made fast with upgraded turbo, and supporting mods.
I would test drive both if I was you.