The 135i does get twitchy when over 100mph. But it's not to the extant some people make it out to be.
Looks are subjective, but i love the way a 1er looks. The 335i is also way more common, so the 135i stands out. An e92 coupe is a beautiful car, but the e90 sedan is the definition of plain jane and you might as well have bought a 328i. But that's just my opinion.
E92 or 135i; cant go wrong with either.