I tried yomeishu before, the taste is too sweet for me.

As for DOM, I think that it has really high content of alcohol in it. That is how I fall asleep immediately right after a small cup of DOM, it can really make my body 'heaty' and hot to sleep at night, good for cold weather though.

DOM is from France while yomeishu is from japan if my memory serves me right.  Not sure whether both suitable for diabetic patient (or anyone who try to avoid sweet/ high sugar content drinks), I doubt so.

Personally I prefer DOM over yomeishu, but I didn't realize it has any effect on me, I mean in terms of rejuvenate, energetic, reduce tiredness, I still feel the same.  One pros is easily fall asleep, that is also because of the high alcohol content in it.

Maybe you should ask the shop assistant for advice. Try survey around and only make final decision whether to get which for your mum.