"Apparently identical" could mean a lot, but if they are identical, it would seem going with the lowest price would make sense.

However, in an overall sense, long-term, the price per rim is simply part of the build. The most recent builds I've been involved with were NOS 6500 hubs laced to DTSwiss 585's and 415's, respectively. The price of the rims could have varied from $50/each to $80/each. In the overall build price, of both the wheelset and the bike, the extra $$ makes little or no difference down the road. We went with the preferred rims and simply paid what was necessary. One set was built by a bike shop, the other by REI and BF's Otto Rax. Both sets are amazing, and 2000 miles from now, whether a rim was $13, or $33, or $83, it really won't matter.

Wheels are what you ride on.