Do you have a preference of race for a top bar hive? The bees will be housed just outside of Portland, OR.
I don’t prefer either. I’ve installed Italian, Carniolan, Minnesota Hygienic, Buckfast, etc. At this point I much prefer the muttiest, feral swarms I can find. I’ve had the best success with them. If you’re going to buy package bees, I’d try to find a supplier that produces treatment free packages. This I’ve not found in the Portland area.