Which is better? (Ignoring the fact that both statements cannot be true even though they are both posted on the Canopus website.)

"ACEDVio is the world’s only analog and DV editing card that is completely compatible with hundreds of video editing applications and all widely used video equipment."

"Let’s EDIT RT and Let’s EDIT RT+ are the world’s only OHCI analog and DV editing cards that are completely compatible with all widely used video equipment and hundreds of video editing applications."

I don't want their editing software, just a good digital and analog card for my computer (don't want a separate breakoutbox like the ADVC110 or ADVC300). As I read the specs, their isn't any difference; what am I missing?

No Canopus product experts out there? Is anyone using the ACEDVio or EDIT RX+ cards in their computers?

The RT gives you the clue that these are RT cards. The plus has more acceleration IIRC. Been a while since I read the specs.

I'd guess that with the RT stuff, you do need their software too. Or at least their drivers.

Best to ask the question directly to their pre-sales support folks.