Should I use 4Sevens single Bay or Xtar MP1 Charger?

I'd be grateful for some help. I bought a 4Sevens single bay Li-ion charger recently for my (2) Eagletac 3100mAh batteries. Works fine, but I notice they come off the charger at 4.12V. Changed DMM battery, and bought another DMM. Still 4.12. I know (from reading here) that this isn't a bad thing, and will expend the life of the batteries. The voltage stays at 4.12 after a few hours.

I just got a MP1 charger as part of a Xtar light set, and it charged the Xtar battery to 4.22V. Same with one of the Eagletacs.

Question is, which charger would you use given these two options?

For storage 4.12V charger, for immediate use 4.22V charger

Ah, good point - I'd never have thought of that. Mind you, I'm a newbie, so I like to play with my SC600W & ST460NW all the time, so no chance of "storage" just yet