the Jester
Legend
Except, the PHB2 is a supplement.
Essentials is a stand-alone product (albeit used with the existing rules set, so it's not like learning a new game).
That's a big difference. There's significant design change in the Essentials line.
Shrug. Looks the same to me, honestly. Maybe it's more akin to rebooting with PH3 because there are some significant design changes in there. But either way, a reboot seems... well, I guess I like continuity in my games more than I like restarting. If there isn't a compelling reason to do so, I wouldn't.
YMMV of course; it's all about personal preference.