ES which ester of test is usually the best quality when made UGL...?
good question.. test is pretty cheap all around, especially the common esters like enan, cyp and prop.. the others like deconate, undeconate, acetate, ect are slightly more expensive to produce, but still cheaper than deca per gram, so suppliers will charge more for them sometimes because they're "exotic", and you're likely to get cyp or enan when buying test dec/undec/ace.
that being said, enan is pretty fool-proof, although there was a couple batches of test enan raws that went out recently that caused some pain from "incomplete manufacturing" or something and resulted in a high carbolic acid content (or something like that..). I'd saw enan, cyp, and prop are likely to be dosed properly.