The similar garments are not as good- they don't last as well and the fabric is not as 'nice' - IME.
It was Giraffe I used;
I've not really felt they're inferior in anyway other than their logo being a bit more intrusive than Buff's, but of course that's my opinion/experience of them, it did take various contacts and samples to find them.
I've also got some absolutely terrible freebies, and an MTB club Endura one that's a bit thicker material but seems to be lasting well.