Which sealant do you recommend?

I am having some rendering renewed at the front of my house and I need to re-seal around some of the windows once it’s cured.

I’ve found in the past that some sealants are not so good. It took me several attempts to find one that was decent in my shower, so I wonder what if any, people recommend?

The b&q home brand was a waste of time in my bathroom and came away after a short space of time, so I’d like to get it right first time, this time.

Has anyone got a white window sealant they can recommend that stands the test of time?

most sealents are ok if they are neutral cure and not assotoxic cure.

low mod neutral cure is the choice as the assertones do not cause it to delaminate from the pvcu frame.