DDJ-SX2 or XDJ-RX ???

Hello.  I'm currently using an XDJ-RX, which I bought because it was one of the only devices that could work without a laptop.  However... I'm not that sure I made the right choice.  I'm considering returning the XDJ-RX and migrating to the DDJ-SX2.  Why?

1/ ddj-sx2 works with traktor, serato and rekordbox (more compatible)
2/ ddj-sx2 has 4 channels, xdj-rx has only 2

BUT ... is that a wise decision??? DDJ-SX2 users, please share your experiences with me.  Good product? What do you think are the pro and cons?

Thanks in advance!

Christophe