Oho....what to do?

Not sure which one you should keep, but fodder the one you don't use. Distant Counter is a very valuable skill to certain units and it's not worth giving that up for a few stat points on Hector.

If you plan on using the Hector you're keeping, then it might be worth to consider the merge. Otherwise, foddering the extra won't leave the original Hector missing those measly 2 merge points.

I'd keep the +def -spd one, spd is the best bane for Hector, and fodder the other one to a merge project to score better in arena.

Okay if you plan on using basic Hector and don't have any other Hector's (which are objectively better), then you should keep the +def-spd one, and either merge if you really like him, or fodder the -def one.

If you do have a better Hector, Valentines or Legendary with good IV's, I'd recommend just foddering both since there's no real reason to use these when they are subpar at best.

Oh, and L!Hector is coming back this month if I'm not mistaken, and he's better overall. I would argue that you could wait a bit and depending on if you like green in the legendary banner, that you could try for him, that's what I'd think at the very least.

DC's too good to merge a Hector, methinks.

If no one you have will use it right away, manual the worse of the two. Then again, you can still use a manual for merges, so there's that option, I suppose?