Zappl is a bit further behind although it seems their development has more time to dedicate to the project.
The most exciting feature about Zappl is they are adding in a direct messenging feature. This will be huge.
At present, I dont like the zap once every 5 minutes and the fact that all zaps appear on steemit in the blog section (the later isnt Zap's fault but a setting the steemit team needs to change).
Overall, Zap is looking better and getting closer too.