I don't rate Lombard. I think a lot of guys in the welterweight top ten beat him (Lawler, Hendricks, MacDonald, Condit, Brown, Gastelum, Saffiedine)...
... I don't think he's a great striker. He hits hard and moves quick enough for the first five minutes, but he's not as devastating as a lot of people make him out to be. His cardio is questionable and he's past his physical prime. Can't see him getting any closer to the belt than he already is.
Romero's also old and past his physical prime, but has less mileage (still young in fighter years). His striking is a lot more fluid than Lombard's, his wrestling is insane and he uses it really well (I don't think Lombard uses his judo enough), but he is chinny and hittable, which isn't a great combination.
Neither guy will ever be champ, but Romero has the better chance of getting a title shot.