Just as there are many "TR"'s which follow the Byzantine text types and have differences, there are many "eclectic" texts which follow the Alexandrian text types (particularly Aleph and B) and have differences.
When askjo says a W&H Bible I'll second-guess him and say that he means a Bible which follows the W&H theory (roughly-older reading best, shorter best, more difficult best, Aleph/B), but not necessarily the text that they themselves produced in accord with that theory).
Generally speaking, the Burgon theory weighs the Traditional Text and Church Fathers over "oldest".
All MV's (in my experience) are a combination of both text types unless they are specifically noted as TR types such as the NKJV.
This is my understanding and yes, this is a bit of an over simplification.
HankD