if u have WooCommerce you must use AliDropship Woo version, otherwise plugin will not work (will work but imported data won't show). I've been testing both for a quite long time and I found Woo version coupled with a WooCommerce templates, plugins and support offers more professional look.
NOTE: Themes offered for FREE by AliDropship are NOT Woo-compatible!!! (and of course this is nowhere to find in their very poor documentation)
1. Using a standard, non-Woo plugin + i.e. DaVinci theme (nice basic design, but not a professional look and feel). DaVinci theme is very much hard-coded (that's why they offer you for free), and it is for a basic site. For more pro looking site buy a pro theme, However DaVinci theme loads fast, but it does not have a pro look so your clients might go somewhere else, or you must do some re-design (I would not recommend as the theme does not have a child theme)
2. Using Woo Nielsen theme (ALiExpress look-a-like theme), having a look like a pro site: many features supporting a product: your account, add wishlist, make inquiry, compare prices, search by price, color, add comment to the existing AliExpress customer review, etc. However Woo themes consume much more CPU and memory so you must make sure you design them well, TOTALLY optimize pages and images, especially if you're going to have 100+ products
I'd definitely go with a nice Woo theme + Alidropship Woo plugin