Either one as the quality of the product is on par
Both of these profiles are on the high end but personally I'd chose rehau
In my opinion, rehau is by far a much better profile for windows and doors. The colour and sculpture shape look much better. I've been fitting rehab for over 10 years and never heard of a problem.
For me is Rehau is from Germany
Both are very good products
Profiles are really close to each other. Rehau, halo , kommerling , liniear. As long as window can be fully reinforced with steel and when reinforced still perform with at least 1.4 u value and A rating double glazed you are just fine.
Aluplast, smarts and rehau
No distinct difference in todays market on profiles.