Long time Pulse fanboy switched to Taptu a couple of months ago -- love it.
They are so functionally similar it isn't even funny... however, there are two wins for me:
1. Taptu is not limited to 20 streams per page (I don't want a tech page, comic page, etc)
2. Taptu will let you merge merge streams (instead of one slow moving stream, merge three slow ones into a moderately paced stream).
To be fair, I haven't used Pulse in months -- maybe they have added the two options above.