Ich bin ein Glocker, so I can't comment on those specific pistols.
I do prefer IWB for concealment. I conceal a G21 (probably at least as big as either of those you mention) in a C-Tac IWB and it works well.
I do prefer IWB for concealment. I conceal a G21 (probably at least as big as either of those you mention) in a C-Tac IWB and it works well.