Both should serve you well. They are both proven platforms. It all depends on which one fits you better. They are both quality guns.
If I had to choose it I would choose the P30. I had a P30 I sold it. It just did not knock my socks off but I think its a better gun these days. Both are pricey. Unless you are really looking for the E2 grip look for a used one. They can be had for under $600. LNIB I rarely see the HK P30 for less than $700.
I do not have a P229 but have own several P228s and used to own a P229. I prefer old German Guns but the P229 has always been made here. If you can get a decent deal they are still good guns.
-Fast is fine, but accurate is final. The trick is learning to take your time when you're in a hurry." -Wyatt Earp
-Its a tool box... I don't care you put the tools in for the job that's all... -Sam from Ronin
-It is the mark of an educated mind to be able to entertain a thought without accepting it. -Aristotle
-Without deviation from the norm, progress is not possible.-Frank Zappa