The difference between the major brands is tiny,
Go with any of them within a given price band
What is important is the fitting.
I would recommend going to your nearest Cotswolds store;
Make sure it's at a time when the store is virtually empty, such as early on a Saturday or mid morning mid week
Each store has at least one proper boot trained fitter
Make sure it's that person that measures BOTH of your feet
Find a boot that fits your feet and your spec
If they won't measure your feet properly, or seem in a hurry to get to the next customer, then leave.
The innersoles of most Mountain boots cost in the region of 80p to the manufacturer.
Get the shop to replace the innersoles with 'Greenfeet', or similar, innersoles which will add another £30 to the bill
I'm a Mountain Leader, I can usually get 2-3 seasons out of a pair of boots, sometimes 4 if I'm lucky.
Over the last decade or so I've had Meindl, Scarpa, Berghaus, Salomon, Zamberlam, all good.
Currently on Keen, which so far are excellent.
(Currently sending some Meindl's with 3 years use back to have the soles of both boots re-stuck to the boots!)