I’d get Northwave Celsius again. Good fit for my feet and reasonably warm with some nice socks on. My wife has the Arctic version and now comes riding in the cold winter months – that speaks volumes. She used to use the Shimano ones but never had warm feet and avoided riding in the cold.
Few grumbles about them:
The sole doesn’t seem to catch shimano spds like my other shoes. 2 or 3 times a ride (and embarrassingly, once at the start of an enduro stage straight into a rock garden), I try to clip in ‘normally’ and my foot slides to the heal or straight off without clipping in.
You also need to wear short socks with the cuff done very tight to stop water dripping down your leg and straight in. Guessing this is similar for most boots though.
I tried several different sizes in the Defrosters and nothing fit my wide feet. The correct length was too narrow. The correct width was about 2 inch too long!
Similar wit the Shimano fit – too long and narrow for me feet.
Quite like the look of those Bonty boots with the built in gaiter.