Now after having both devices, the n900 and the galaxy tab for a while now and carrying them both around all the time.
n900:
I do love the Phone/skype/voip application(my Phone rings and I don't even know if its voip mobile or skype call without looking) on the n900, same with the messaging: one program does it all.
Galaxy Tab:
Still love swype
and I am starting to get annoyed with the ads in basically every program