I've carried both.
with the 43 for pocket carry, I couldn't get use to the flush mounted mag and needing to curl my little finger under it so I add a Pierce +1 which gave me a full hand grip but, of course add to the grip length, which made pocket carry less than optimal. adding Pierce + 1s to spare mags made them less than optimal for pocket carry as well, they became more difficult to with draw from my pocket for a mag change.
got a Comp Tac Infidel holster with snap straps and a Sticky Holster's dual mini mag pouch to carry spare mags off hand back pocket, my preferred holster and carry carry mode I've used in the past with double stack Glocks.
carried as described, in short order I came to the realization that the 43, carried IWB, was the most comfortable all day carry set up I'd tried, I found myself occasionally touch my weapon to make sure it was still there, literately forgot it was there a couple times, never experienced that with the 23 I carried for years.
seeing that I had reverted back to IWB and would no longer pocket carry, why have only 7 rounds when I could have 10 in basically the same package so I sold the 43 and got a 48, but it wasn't as comfortable to carry as the 43, longer slide just hit my hip in the wrong place.
so I sold the 48 and got a 43X MOS, mounted a Holosun 507K X2 and added a Hogue beavertail grip sleeve with finger grooves (which I think is the single best accessory for the 43X/48), used the same holster and dual mag pouch and I was set.......until I found Shield mags that held 15 round, so why have 10 rounds when I could have 15 in basically the same package, so I ordered the 3 mag/steel mag catch combo and TA-DA my perfect carry rig to date. I have over 2000 rounds fired and, until something better comes along that can address MY specific needs, I'll keep the 43X MOS as described.
SO........
if your set on pocket carry, the 43 is really the only one that will work of the two, if your going to holster carry, get the 43X.
and I'll go one step further......
evern if you have no plans on mounting a RDS or a WML get the 43X MOS, it does everything a 43X can do with the addition of one very important feature......options.