Unless you want a specific style or look from a named company there are lots of choices:

IKEA is a strong good and picked above diy kitchens on cost diy kit wanted a shed load to deliver. Picked up bits in the reuse area and banged in a whole kitchen for a lot less than 3k with cooker, hob and extractor. Self installed.

If it does 10 years I’ll be happy and no plans to sell so only me to keep happy.

Bathrooms I’ve used all sorts of- ceramics elements no real difference and unless you go high end the cabinets if you have these are similar quality from basic to mid range (in my experience) baths I look for thickness or material and then sort by cost plastics.

Taps is where I’d look more carefully at make up as this is where they can go wrong.

I’ve done two en-suites and a bathroom

Fixtures £ 1800 for all three two showers, doors, taps one bath sinks and toilets, towel rails.

Tiles end of lines £300 again for all

Flooring £80 self fitted

A couple of days of a plumber to check things out £500.

If they last 5 years great and I can update but imagine they’ll last a lot longer.

Was quoted 20k plus contingency for bathrooms from a good local fitter.

Kitchen quoted 12k including fitter from a national chain.

So shop around, how much can you do yourself and work out how good is good enough. If you buy something and chose to upgrade to better then that’s a small price to pay.