We can get some information about Ethereum from their activity page and badge system I think...
https://forum.ethereum.org/activityEthereum BitShares+-725 people have ever made a post +- 2970 have made a post (4 x more)
+-95 people made 10 posts+ +- 810 have made 10 posts+ (8X more)
2 People have made 100 posts+ +-140 have made 100 posts+ (70X more)
34 made a first post in June At least 72 made a first post in June (2X)
58 made a first " " " May At least 120 made " May (2X)
'Ether Sale FAQ' 15K views BitShares Status X update 43K views
(Next most viewed topic <5K) (We have at least 10 other topics viewed more than their most viewed 15K topic.)
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- I would say the BitShares community is about 3.5-6 X Bigger than the Ethereum community based on forum stats.
- In terms of a strong community, we have 8X more people who made 10 posts or more.
- I would say at the the moment though we are probably only attracting 2X as many new people as Ethereum a month.
However, considering we have been in limbo for a few months I think that is pretty good. When BitShares XT is released (real soon

) that should really stretch the difference. (This based on info I could derive from their forum and badge systems they may also have a big community on Bitcointalk or elsewhere that they have thus far been unsuccessful transferring to their main forum?)