I've fitted Hager, Wylex and BG boards (all RCBOs). BG I will not do again, mostly due to critical alignment of the modules with the lid, the DIN rail is just too flexible so unless your incoming tails are tensioned just right in the main switch (not pushing it down too much, and not pulling it up too much) there's always difficulty closing the lid. It sounds a trivial thing, but its enough to make me say "never again!"
Hager boards are good, the quirkiness with the square knockouts notwithstanding. I tend to find all the action is on the right hand side (particularly with SPD fitted) leaving some bits cramped, other bits with loads of space. But very happy with the quality - rigid DIN rail, not problem fitting the lid, earth/neutral bars not made of cheese etc. Can easily insert/remove MCBs/RCBOs without affecting the busbar. Type A RCBOs, and can get bare boards supplied with a type 2 SPD.
I've recently started fitting Wylex boards (the "new look" NMX14S) with SPD, these are very nice, with good space inside; again, good rigid DIN rail. The only design niggle I don't like is you have to knock the (round) knockouts out from the inside outwards. This is fine when swapping the board, but if you're later adding to a populated board, it turns a simple job of adding another circuit (without going through the rear knockout) into a more complicated job (unless I'm missing a trick? maybe hitting them sideways with a screwdriver?). Like the SBS boards (which I've not used), the Wylex have switched neutral (type A) RCBOs - if used on a TT earthing system, it's a no-brainer. They're a tiny bit dearer than the equivalent Hager boards (from my wholesaler) but they're growing on me, after being a Hager fan for a while.
Hope that helps