but it doesn't compare now since we have retail RTB.
You really can't compare them much. They had the same idea, but different approaches, though I know what your saying.
Personally, Retail has the new feel and has processed ideas and whatnot fully through with events, bricks, user interface, etc. RtB, though, has a classic feel. Like old furniture. It may rarer and worn out, obsolete with new style, but it just has that feel to it, that look and comfort of its own. :D