Maruja - My preference for the Haka is bias! I've played notes on each and actually there's little difference **when I play them**. If you forced me to choose which is easier to play for my right hand, then I'd say the Zen-on. But I still prefer the Haka. But I haven't played properly since the end of June when I damaged my right arm and wrist very badly. It still isn't right and when I do start playing again properly (on Tuesday) I'll effectively be starting out again (again, again, again, again...) If I'd have thought logically about this, I'd have got my husband to do a blind test with me so I didn't know which recorder I was handling. But having now handled them both again, I'd recognise them. In my case, part of the problem - if you take away the deformed little finger - is poor technique. So, I'm pretty certain that a good teacher would help me to fix the reach problem. I'll may manage to fix it myself but it will take longer! But your hand shape and posture may well be different from mine so I'd say try them both before you decide which (if any) is right for you. I live a distance from any shops, an even larger distance from any music shops and because as yet there is no sensible profile for Covid, I'm not venturing out. I've had two close relative die of what some of the intensive care Covid deaths have been and until science lets me see the profile, I'm not taking any risks. So even if I could travel the distance to a music shop, I wouldn't go out for something that to me is that trivial. I simply buy and hope for the best and if/when that doesn't work out my husband buys me something different next time there's a need for a gift. In any case, I collect recorders like some people collect fountain pens so getting it right isn't that important to me. If I was younger - it would be important, I'm sure!
I've just weighed them and the Haka is 167 grams and the Zen-on 147 grams. If you want to know anything else, just yell.
Did you have a nice time at the fair? I'm remembering the last time I was in Buckingham - it was several years ago. We went on to Banbury on the same day but we had a nice cake and coffee in Buckingham and bought a cuckoo clock!