Dear Kitchen experts/ owners

I would love some advice if you can spare a few minutes please

We are planning a large kitchen diner extension in a house we plan to stay in for good. We want a contemporary clean lines look kitchen that is good quality to last a long time. In built appliances, island etc. There is a utility that will need new cabinetry, worktops etc but this can be much more basic as it will be a functional work space, boot room, storage so no need to be fancy. I was considering ikea in the utility to be honest.

So far I have looked at NEXT 125 kitchens (premium brand of Schuller), Siematic, Baulthorp, Naked kitchens or bespoke cabinet makers. I know that all the German brands cabinets are essentially MFC but there is a huge range of finishes for the doors. Are these brands worth the money?

The bespoke cabinet made companies have an excellent reputation and will look amazing but Im not sure if they will look as good in 15-20 years time?

Thank you in advance for any help