I'd go for the cinny as well for a variety of reasons:

1) More possible combinations with your current animals.
2) I love cinnys. (Irrelevant)
3) He shows promising het markers where the other male does not.
4) Lesser/Butter combos can produce babies with overly large bulging eyes.
5) You don't really like BELs anyway, so you should definitely get the cinny male.

I feel that given this logical breakdown, the answer is clear. lol.