Need help on scope choice

[birddog67]

I have seen other posts but I am torn between 2 scopes a 4.5-14x50 ziess and a 4-12x50 Swarovski BT plex. Redical I will be shooting max 600 yards . This is on a 300 Ultra mag, please give + and - also where is the best place to buy off the Internet , thanks