As liseevolution stated, try on as many pairs as you can and all brands. dont corner yourself to one or two boots.
I bought the Kaijus (bought/tried on locally) due to the internet rave and excellent reviews. although it is comfortable i am not too crazy about the laces and the added puff.
I think if i could do it all again i might go F20's/22. But i am happy with my Kaijus aswell so i am not wasting more money.