Anything and everything 2000/2500/2.5.

I am rebuilding a spare 2.5 engine for our PI, at work we have County and "Hepolite" pistons, on closer examination the "Hepolite" ones are AE Federal Mougal , are they still as good as the original yellow boxed Hepolite ones were or is there not much to chose between them and the County ones? In general I am weary of County products but have spoken to a few people, Oselli in particular who use them on their TR6 engines and say they have no problems. Any thoughts practical experiance would be greatly received.