I enjoyed both a lot, but I'm going for TWOK. And no, I'm not one of the old guard. I was born in '82.
STXI was a good movie, and its saved Star Trek, but people are forgetting, so did TWOK. TMP was a commercial success, but a critical flop. Something radical needed to be done. TWOK gave us a Trek film that was not just popcorn fun (although it was), but had some depth in the storytelling.
I think people are voting for XI because its new. In a few years, it will be interesting to see how it comes out in favourite Trek film polls. I'm not dissing it, BTW. I enjoyed the new film. But I still think TWOK is the best.