Tyr's defense down is more important because thunder teams lack strong and proper utilities. Thor's paralyze is good, if it successfully applies that is, which it not reliable in the first place and shouldn't be something you'll ever want to have to rely on to clear. You'll use both if you have them, not like you have much other options.

And no, Tyr is not better than 'most ssr', in fact, the current roster of thunder himes is pretty awful compared to what every element has.