short answer, there is no ergonomic mech keyboard that compares to the kinesis, everything else is trash (in terms of ergonomics, they skimp out on a lot), second answer if you've never typed on mech board b4, don't because the crispness from it is nice compared to basic rubber domes.
but the only best merger between mech and ergonomics will be the kinesis, every other option does it half @$$. yes kinesis costs $$$ and deter's a lot of ppl, really no way around it.