I try both and sometimes three or four brands. Each brand of the same size put a different load on the engine. A good example. Saito 72 on a APC 13x6 is a great combo. Same engine on a MA 13x6 is terrible. Another example my Saito 1.80 will not run a Zinger Pro 18x6. It is to much of a load. APC 18x6W is OK but spool up is just OK because of the weight. Regular Zinger 18x6 is pretty good.

David