I only have the KF Lite 2021 which I've been very happy with - the aerokon pin makes it adjjustable from super tight to loose MTL, its ridiculously easy to wick and build and I've used it daily for the last 6 months - before that I had the 2019 version. I like it so much I haven't bothered with any other MTL tanks as it just seems to work for me.
I can't comment on the Dvarw MTL as I've never had one.
Before buying any of them check carefully to see if you need extra airpins/inserts or tank extensions as the end price can escalate quite dramatically and be way more than the £90 you have in mind.
Personally I would try to buy a clone of each (decent ones come complete with optional accessories) to assess which you prefer and then, if you think it is worth it, buy an original and use the clone as a work/pub/beater tank.