Speed matters up to the point where it exceeds the speed of your internet connection if that makes sense.

The slowest part is the initial sync. Once it's synced up to the blockchain it'll run smooth with any modern broadband.

So a faster SSD helps with initial sync assuming your internet connection can keep up with the disk I/O.

Once it has synced up, it doesn't matter.

Any name brand SSD is good for this because reliability is more important than speed after the initial sync, hence going for the cheaper SSD rather than a high end M.2. A Samsung SSD should be reliable regardless and my internet can't reach the speed of an M.2 anyway.