MediaWiki vs. wikispaces

I heard from Steven Wood that Sourceforge is now offering Wiki's to
projects in collaboration with a Wiki hosting company called wikispaces.

He asked me to comment on this possibility.

I'm not a wiki expert by any means, but I do have a bit of exposure.
I spent a couple of days doing various comparisons (mostly just
reading on the web comparisons that others had already done).
I recommended to my company to use TWiki, mostly because:
o) most popular wiki for intranet use
o) has a VMware-based install, making it really easy to start
It's worked out fine.

For BitPim, I think MediaWiki is a good choice, because
o) familiar look and feel (everybody reads wikipedia)
o) it's already up and running

The main advantage of going with a wiki hosting company
is that the administration is done by somebody else.

The main disadvantages are:
o) pay via ads or real money
o) may go out of business: would require porting to another wiki

In case you are not aware, there are lots of different
wiki mark-up languages. They are all text based and
are all easy, but different with somewhat different capabilities.

I've looked at the wikispaces mark-up language; it seems
very similar to MediaWiki, but I did not see anywhere that
claimed compatibility. Their look and feel is similar, so
perhaps wikispaces uses a MediaWiki engine, with some
customization. Or not.

I've also used pbWiki, which has a similar business model
to wikispaces. They rolled their own wiki mark-up language.

Bottom line:
I don't see a compelling reason to change away from
MediaWiki administered at BitPim.com

Any other comments and/or experience?

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