As others stated, you should decide based on focal length only. Personally, I picked the TS-E 24L II as my preferred focal length, after spending some time shooting my intended TS-E subjects with at both 17mm and 24mm (testing was actually done with the 7D + 10-22mm; I bought the 16-35L II and sold the 10-22mm about a month after getting the TS-E 24L II).I bought the 17mm TSE II (incredible) Lens first...based on the fact that (much to my surprise), I could use my Canon 1.4X III to increase the focal length of the 17mm to 24mm and get as-good (OR BETTER !), IQ as the 24mm TSE.
Better? If you're referring to the original TS-E 24L, maybe - but the TS-E 24L II is sharper than the bare TS-E 17mm, and decidedly sharper than the 17 + 1.4x (very obvious in the TDP crop comparison).
+ 100 for me too, Sir.
This TS-E 24 L MK II with me / on my one camera all the times( For Super Sharp, High Contrast in Colors and For the Special Effected of Selected DOF), Another camera = 70-200 mm L IS, and the Last Camera = 85 mm 1.2 L MK II---( Yes, I not use my Trusty 24 -70 mm. 2.8 L MK I any more, just in my dry Box, after I get TS-E 24 L MK II 5 months ago).