The new Contis are truly exceptional tires. The bicycle rolling resistance data on the larger sizes shows they have improved the great numbers on their previous tires (the 25 was not much better there but the 32 was). In general there is a reason why more serious cyclists run Contis than any other tire. They also mount up super easily compared to the previous TLs.

Re: 28 vs 30, there is not a lot of difference but personally I am a big fan of 30mm. I switched from 28 to 30 a few years ago and the comfort level is well worth the ultra-miniscule resistance and aero penalty for me a non-racer. I have thought about going to 32 and I might some day, but my new Contis I got 30s in.

Note that competitive cyclist had 28s in stock last I looked..