Rocket Stoves vs. Masonry Heaters?

Not to pick a once-and-for-all who's the best, but to get a sense of how they compare to each other; I got really into masonry heaters a while back, but have thus far found little one can do about the cost (though I'm more than open to ideas!) because of the material itself. How do rocket stoves compare for efficiency? I can see how they're much more accessible, so much so that I wonder if it's not entirely an aesthetic thing to get a masonry stove installed instead. In a pre-industrial situation it would just be a matter of whether you've got clay or stone nearby, I'd imagine, but in modern times, if either has to be shipped to the site...

Thoughts?

Marvin Warrin : Truly, Rocket stoves can be as efficient, or more so, totally dependent on the materials you make them from ! You have a great chance to ask any
question You want to. Two of the True Experts in Rocket Mass Heaters Ernie And Erica Wisner, who often check in here are making them selves available through
Friday to answer questions ( after that you will be stuck with us just plain mortals! Materials for R.M.H.s are where you find ! Come on back Big Al!

Allen Lumley: Thanks! I posted specifically because I'd heard Erica and Ernie would be passing through, and I guess I wanted to know in part what attracted them to RMH's rather than masonry stoves. I'm a little short on specific questions because I feel like a lot of the particulars depend on the design/er. Limitations of RMH's and where they might be inappropriate might be an interesting topic too--if there are any such situations

Marvin Warren : Great ! You have sharpened up your questions a little, and The answers you can get from Ernie or Erica will be more interesting to more new members
just like you ! I really was not trying to highjack the discussion ! I think E & E will give me a pass !

If, after you have had the chance to check out all their answers, if you still want more information, You can go to cobcottage.com to get a PDF Copy $15.oo of
Evans' and Jackson's Great Book Rocket Mass Heaters, there is STILL no other Book in any Language with more Rocket Stove/ Rocket Mass Heaters
information any where ! (and I don't make a nickel !)

Both Ernie Wisner and Kirk Mobert completed their initial learning experimenting with Ianto Evans and Leslie Jackson ! For the Good of the Craft Big AL!