Funny, I've got clear favourites in both cases shown.
AvB is designed to put shots against similarly-ranked shots - except when newly uploaded, in which case they run against progressively higher-ranked shots to get an approximate ranking. If it's hard to choose sometimes, the system is working as intended.
I've been thinking for a while about a small redesign in this area, but it needs some prep work to be completed first. I'll have a think about. whether a "skip" button would work. My gut feeling is "no, we really want a decision in those cases", but I'll think some more.
In the meantime, just pick one. It's really unlikely to do any damage. The "loser" will end up being compared against lower-ranked shots and start winning, vice-versa for the "winner". Before too many votes, it'll be within the margin of error anyway.
Let him that hath understanding count the number of the beast:
For it is the number of a man; and its number is One hundred threescore and twelve.