It's Chicago by a mile. No matter whether it's taste (he makes the best sauce I've had in Taiwan, and he puts on as much as you want-and it's real pizza sauce!), or value-you simply can't beat his 2-for-1 takeout special-two larges for about $500NTD. Not really a sit-down kind of place, though it is possible-don't know if he sells beer or would mind if you brought in your own.
Alleycats has gone downhill noticeably, see my comment and that of Xiaoma in the Alleycat's thread. Even at its best, I still think it wasn't the equal of Chicago, especially the sauce, though I did like the four cheese pizza.
For me, from now on, only Chicago will do.