I have both. I primarily consider the 42 a backup gun and it's normally "off body" in my backpack. I've switched to Underwood's Lehigh XtremePenetrator as I've become convinced (from other's reviews) hollow point in .380 doesnt have the necessary penetration.
I do carry the 43 on body some. I prefer the doublestack Glocks and more commonly have a 26 or 19 when I carry but the 43 is more comfortable IWB. The Fed HST rounds I use for 9mm cost a lot less than the XtremePenetrator so I practice more with what I carry too.
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