I'd go with the Rome Flag personally, but mainly because I have only seen the Flag in action and know it to be great. I haven't heard bad things about either though, so...it's really up to you. But yeah, if it were me I'd go with the Flag.
I generally use Neversummer as the benchmark for judging other quality boards. They are hands down one of the best manufacturers out there. The 3yr warranty, tough as nails boards, I would lean towards a NS myself. Rome is not a bad choice either though. They also make a solid product.