Neither.
23 is too big and bulky, whereas 27 is too slow and narrow.
X100T is not bad (I own one), but it's overpriced imo, no articulating screen and way too soft and hazy at macro range.
Therefore your best bet is 18 - small size, relatively cheap, has an aperture ring unlike the 27, and wider than 23 (just crop a lil if required).
In fact that's exactly why I bought mine.