You mean Bosch Platinums?
I've tested those once, 30 years ago, and quickly threw them away as pure junk.
I have excellent experience with Bosch parts otherwise. Perhaps mostly due to having german cars as daily drivers.
I have had excellent experience with NGK spark plugs since the 60:s, and I try to get them for everything but the four ground electrode VAG plugs, where I normally buy OEM.
I see that NGK appears to have different series of plugs in Europe and the US. I have used (euro) BPR5FS, BPR6FS and BP7FS in my 351C, but these are very expensive here, and I've tried to locate them in the US, but it seems NGK recommends UR-4 there, which I have never seen here.