Um actually both are saffiano leather unless you meant you want the dome in patent leather. I am 5"2, but I do own a large burgundy East West tote and a parisian blue small dome satchel! I have seen the double zip in person, it's heavier and I just don't think it's necessary to have so many compartments? I think the small dome is a perfect size for smaller people (5"4 and shorter) or for those who are lazy and just like crossbodies
The leather is very nice, but I wouldn't say it's the best quality. My East West tote (Ok I take very good care of my bags) one of the corners there has already been a slight rub (ok very very slight, I am just picky) and the corners have already darkened a bit (burgundy is dark I guess the leather picks up dirt very easily...). Also some gold ware has chipped off but I guess that happens with all bags no matter how good their quality is...The East West tote (I suggest you check it out) is just like the double zip but a larger version and it doesn't have the two extra zip compartments, just a normal tote. The one I have is the large version but it's not too big on me (12" x 16"inch I believe) but there is a smaller version I think 10" x 13" or something which would suit you as well if you don't like big bags.
I think for the price, the dome is definitely worth it. The double zip is more expensive, just for it's quality I don't think it's worth it although if you compare it to
Prada's double zip tote it's like you are getting a very good deal (both very similar!) The dome bag I guess is slightly more special in my opinion, you see less of dome bags out there especially crossbody ones. Don't expect perfect quality, but it does look very good. I suggest you check out if you are getting the black small dome on ebay, I saw a few and they are all authentic...TB hardly has any fakes. I wouldn't buy it for the full price. I got my small dome for 340 USD including shipping