Baxi vs Vaillant combi boiler

[LakeFlyPie]

We need to replace our boiler.
Vaillant is coming in £500 more expensive than the £2500 Baxi.
Is it worth it? I've heard Vaillant is quieter but that's not an issue for us as boiler is in utility room.
We've currently got 30kW system which is adequate for our needs (due to crap water pressure). Is there any advantage to increasing to 32 or 34 kW?
TIA

What about Glowworm? Made by vaillant but much cheaper. We've just had a 30w vaillant installed for £1850 all in. 7 year warranty too.

Thanks for reply, it's actually a Glowworm we're replacing. Gas man has only offered Baxi or Vaillant, options ranging from 30-36 kW at various price increments.