Cam follower is easy peasy. FSI has more maintenance overall, but if you can nab a single owner car that has been well maintened, you reduce the risk.
Saying that, if I had known more about the FSi/TSi hoopla prior to my purchase, I would have actively sought out a TSi.
And to be fair to the FSI, the early TSi engines had issues of their own. (Late 08, early 09). Not alot affected, just a few. Such is with new tech, great strides always come with a few "oops" slapped on em.