There are few 70%s i don't like, but it is so much down to taste.
Back when i finally admitted i had to make the switch, i did my usual mildly-obsessive investigation, expecting to find one or two i liked, and many i didn't.
The methodology was to buy 1 bar of every kind of 'good' choc i could, starting with Tescos (our nearest supermarket) and slowly extending my explorations through Lidl, Aldi, Morrisons and Sainsburys. We don't have a Waitrose.

I have since spread the net wider.
It came as quite a shock to discover that i found something appealing about nearly all of them. The only ones i avoid are Green and Blacks 70%, Godiva and Hotel Chocolat. Too posh for their own good. Lol. Aldi and Lidl's and Lindt are now my convenient standbys, but enjoy many others if i visit a source.
The trick is to comparison test 2 at a time - then you ALWAYS come away with one slightly better, one slightly worse.

And never overload your palette with more than a couple of squares of each at a time.
Blimey, i sound just like one of those dreadful wine snobs.
Though why anyone would drink wine if choc was available, i cannot imagine...
Hahaha!