Until very recently, I was employed full time as a trout-farmer and I have tried em all.
I have had a very expensive pair of 'hunters'...I cant remember what they were called, but they had hand-stitching and a leather lining (I got em for £55 from TKMaxx, I would never part with the rrp which was over £200). I have wide feet and they hurt like buggery. My wife now has them. I have had various Aigle wellies, bur the zippy ones seem to fall apart from there. I ended up buying cheap green wellies in bulk from the Strauss catalogue. They had the added benefit of steel toecaps and natural rubber soles (useful in aquaculture as they grip well to wet concrete). I think they are under a tenner a pair, and I didn't mind so much when one pair only lasted me six months.
Since I don't do that anymore, I'm experimenting with non-toecapped wellies and have bought the most basic Aigles for £20, my reasoning being that they dont have the zip and therefore have less sites to fall apart from.