I agree - I'm 5'5, but I think I like the look of the Mars better. I'm surprised I found only one place that carried the black mars boot and one place that had the caramelo. In plain leather that is. The mars this season is this awful black/tan - or suede/leather color combo, talk about ruining a good thing. That's why I purchased the mars caramelo too. She's changed the design this season and I really just wanted the plain classic leather boot.
My only reservations was that I have my pristine Marant Dicker boots from last season in taupe - which is in the same color family. But I convinced myself that they material had shades were different. The Marant boots seem fancier to me - the caramelo Mars are more casual. That's my rational and I'm sticking to it!