the title says all what should i do
Why not both? You get the reliability and power of gmail, plus push contacts and calendars (and, with the right clients, you can backup your contacts/calendars). You can also use push email to notify you of important/urgent gmail. See the previous discussion here: https://forums.macrumors.com/showthread.php?p=5985838#post5985838the title says all what should i do