Well, I'm starting a new project, a Front Mission fangame, on one hand I like XPs ease of use, and the fact that there are much more scripts than VX, but one thing that makes me turn away from XP is the mapping system, but then again you can import new tiles so much easier than VX.
and on the other I like VX in general, besides aforementioned problems with it. I'm really not sure which one I want to start this new project on, any advice? And I'll be using a turn-based strategy script.

Thanks for any advice or help you have to give me.

You'd probably get better results if you asked in each of the engine forums RMXP or RMVX?

I'm not sure the key differences between XP and VX at present. Perhaps one has more resources than the other. Perhaps one is easier to use. Perhaps one gives better import capabilities. That's a tough call.

Personally I'd say go with VX. It's a stronger engine. It also has a few more scripting capabilities than RMXP. If you searched hard enough, you could probably find a plethora of RMVX scripts.

It may just come down to "What are you trying to do with your game?" Which is a question you should probably ask yourself why checking out the features of the games themselves.

I hear the mapping in XP is much better than VX (but this is just what I heard) but personally, I think scripting is much better in VX and it's a little more user-friendly. It all comes to trying it yourself in the end though, you're not going to get any clear cut answer.

At first I used Xp. But I liked VX, so I suggest VX.

A question that has been asked more times than the phrase "Did Michael Jackson really molest children?".

Sigh.

http://pockethouse.wordpress.com/2009/08/06/rmxp-vs-rmvx/

Apparently this awesome comparison blog was recently marked as private, but if you have a wordpress account you can see a highly detailed comparison of the two.

I have decided XP.