Hi there,
I don't think you need a lift at all provided you appreciate you do have a moderate degree of breast asymmetry to start off with. 
No two breasts are the same, they are "sisters" but not "twins"! Less is more, and I would personally recommend doing "less" with a straight breast augmentation without lift with possibility of using different implants to help improve the minor asymmetry that you have. Of course it'll also depend on your desires and expectations, however I do think this is a more prudent advice as you are not committing any scars on your breast mound unnecessarily especially with both your nipples in very favourable positions above your breast folds. Obviously you'll still need to be prepared for possibility of either a lift or a nipple reshaping procedure down the track if that's not enough. Most likely, I suspect you'll be very happy with the degree of improvement after the surgery and most of all, you still have options for further enhancement in perfecting the ideal surgical result!
In terms of technical consideration, it really depends on your preferred style and surgical outcome. Assuming you have decent amount of tissue coverage in the upper pole, I believe you'll have very good results with either round or tear drop implants, in front or behind the muscles. Best option would be to discuss your situation with a plastic surgeon whom you feel would be able to achieve a result that is right for you and have the trust that he or she will advise in your best interest! 
Hope that helps!
Best wishes
Ellis Choy