no offense leigh, certainly none intended-- i just tried rodinol once or twice over the years and wasn't impressed. Your results may vary, of course.
it's just that my advice for this guy, as for everyone, is to start simple and go on -- and it doesn't get much simpler than d-76. Yes it arrives as a powder and in 20 minutes it's a liquid which has really good keeping qualities.
DDX looks like ilford's version of microdol x -- and it comes in a liquid... absolutely nothing wrong with that formula..