Kinesis is difficult to customize and sometimes has connectivity issues
Glove80 feels cheap
Moonlander doesn’t have many keys and thumb cluster is on odd position
Considering the prices, the moonlander is about US$100 cheaper than the others, so feels like a better option.
I am interested in options with keywell, as they feel way more comfortable, but anything will be better since I use an conventional non-split keyboard.
The right menu links to a compare tool but there are so many.
My hands are small, so it may constrain the options I have. Or maybe not.
What are your opinions/suggestions/experience with these types of keyboards?
It looks like you're focusing on prebuilt boards. Most ergo mechs are sold as DIY kits with a fair amount of soldering required, and for keywell boards it's very common for them to be fully handwired.
You can also buy assembled keywell boards, for example from bastardkb and there are a few folks who build dactyls for sale. These options will probably be relatively expensive as they are basically handmade by one person.
Flat ergo boards will be cheaper in general than keywell ones. If they have a tenting option and you use keycaps with a strong sculpt like SA or MT3, that might get you a fair bit of the way towards keywell functionality. But you'll still need to find a good layout for you (which is totally personal).
When searching for DIY Keywell models, use "dactyl" in your search terms for most results. Most DIY Dactyl builds are handwired, although there are some models that make use of flexible PCBs such as the ones from BastardKB. (My keywell board is a TBK Mini from them.)
Re: the number of keys, this is pretty personal. Most ergo mech users are using something in the ballpark of a 60%, 40%, or 35%ish layout. (My objection to the Glove80 is that it has way, way too many keys for me)