Here's the specs on the 3
GLOCK 27 Caliber.40 Length (slide) 6.29 in. 160 mm Height 4.17 in. 106 mm Width 1.18 in. 30 mm Length between sights 5.67 in. 144 mm Barrel length 3.46 in. 88 mm GLOCK 30 Caliber .45 Auto Length (slide) 6.77 in. 172 mm Height 4.76 in. 121 mm Width 1.27 in 32.5 mm. Length between sights 5.95 in. 151 mm Barrel length 3.78 in. 96 mm GLOCK 36 Caliber .45 Auto Length (slide) 6.77 in. 172 mm Height 4.76 in. 121 mm Width 1.13 in 28.5 mm. Length between sights 6.18 in. 157 mm Barrel length 3.78 in. 96 mm
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Looks like if you "average" everything out, the 27 is slightly smaller than the other 2. Now, the size difference is quite negligable, and they all are "basically" the same size. The 30/36 is in the same class as the 27, and not the 23, but the 23 is no more than a 1/4-2/5 of an inch bigger.
I'm a big fan of them all. you do get a few more rounds w/ the 27 though. As long as you're not set on a certain caliber, I'd say go w/ the 23 or 27. 27 will be slightly easier to conceal than the 23, but not a whole lot.