luxry,money,wealth just name it may just be meaningless without happiness and true love. Now search yourself do you love your ex gf? Do you love your new gf better for real or just what she has? Are you ever satisfied with your ex gf b4 you met your new gf? Who truly is the best for you if you put aside luxry,wealth and whatsoever the advantage you think you will gain frow your new gf?
If you truly answer the question without being biased. Then answer this last true one. Will you ever make it without your new and ex gf's?
Having said the above here is my advise your ex may be the best for you depending on your answer and if you have not been compatible with your ex ,your new gf might fit. You know in your hearth the right thing by now. Dont hesitate to take the new gf and move on with your life if she is the best. I mean don't try to please your ex and displease yourself that's the most worst scenero.
Search deeply ,dont marry because of money and luxry alone the marriage may not last. You loose happiness and love which are God given. Money cant buy true love. Now decide