I'd say it depends if you want a winter or summer boot. I love my Bromonts but they are for winter only as they are the insulated ones, as are Grassmeres I think.
The Bromonts now come in a non-insulated version as well.
I have just bought some non insulated Bromonts, they are so comfortable and I find them better than Grasmeres for riding as they support your ankle better.