Stat chart for your reference. Stat choice really depends on playstyle:
PVE = Standard Full VIT, tank build is preferred. You want VIT for the HP bonus, not necessarily the Defense, because you'll hit the cap relatively easily using proper gear and Steel Body + Iron Skin (if you refine your endgame gears, Iron Skin isn't even necessary). Better HP pool to absorb hits and tank more monsters in grinding.
PVP = Either Full VIT or Full AGI, or some mix. Again, you want VIT because of the HP bonus (helps you survive those pesky DOT skills that bypass defense). You want Dodge from AGI because of the excellent modifier that Monks have. High Dodge combined with your naturally high Defense makes you very tanky.
I wouldn't really recommend a full STR build in many cases because due to the way damage is calculated, the impact is quite negligible. That is unless you do tons of PVP and you dedicate yourself to destroying high dodge targets. STR builds are mostly for getting a higher Hit stat which you'll need to hit other high dodge targets. There's also a very cheesy 1v1 perma-stun build you can make, and having High hit makes that more likely to succeed.
Deciding between STR vs INT (mostly a card/rune choice), always choose STR if you can. Damage wise, they have the same benefits, but as you see from the chart, STR offers better Parry and better Hit.
Last note: until you reach Master Level, your stats will be capped at 50. Save up your stat points once you reach this cap, then when you become Master Level, the cap is removed and you can place all 350 stat points into whatever you like. There's a Stat Reset Vellum when you reach level 35 if you decide you want to change your stat build, but to be perfectly honest, your stat build is negligible. Even a difference of +/- 50 stats or whatever won't be noticeable enough for you to worry about.
Edited by Arbalist, 15 June 2015 - 11:27 AM.