Without getting into brand issues, it's important to know that the output of a windgen will be roughly proportional to the square of the blade diameter and to the cube of the windspeed.
I looked at manufacturers' claimed outputs a couple of years ago when I was going through the buying process. Their claimed outputs at a given windspeed were all about the same once one adjusted for blade diameter. To put it differently, fit the largest propeller you can, and the output should take care of itself (within the limits of the available wind). Calder's book has a good table comparing the claims, or at least my older edition does.
So your decision (after prop diameter) will hinge on other things: reliability, weight, ease of installation, service, price, etc.
Based upon what I've seen for the last couple of months, I expect that the output of a windgen would disappoint in the Chesapeake, though I know from personal experience that they're much more valuable in the Trades.
FWIW, I bought an AirX for ease of installation and light weight, given that it had the largest prop I could fit. Since then, I've been impressed with their customer support.
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