Would you get a closer shave with a merkur 11 c open comb razor or a merkur slant razor

you can get an equally close shave with either, but the slant is considered more aggressive, so it may take less passes. Either will provide great shaves.

I have both and my slant (SledgeHammer) gives me closer shaves.

TBT: Ive only had the 11C for a cuppa weeks, tho.
Maybe I need more practice with it.

you would get a closer shave with a gem.