If you are using the Phillips hue bridge, that forms its own mini network, and the fact that that mini network is using zigbee shouldn’t in anyway impact what you choose for your other devices. The integration between SmartThings and the Phillips hue bridge is an LAN integration.
As far as choosing zwave versus zigbee, each has its own pluses and minuses. See the following article in the community – created wiki:
http://thingsthataresmart.wiki/index.php?title=Z-wave_versus_Zigbee
Many community members have some of each protocol, you just need to make sure that you have enough repeaters for whatever you are using.
Read the following FAQ on wireless range and repeaters and it will explain that issue. In particular, read post 11 in that thread, then go back up to the top and read the whole thread.