why don't you go to a wedding expo and see the difference in style/quality ( for each company and country, according to the females, frances and mona lisa produce the most stylish and sophisticated photos, but also the most expensive, expect HK$20 ish) for yourself as well as your partner, determine whether which is suited for you and your budget, according to female friends and my wife, taiwanese pre-martial photos company emphasise on their natural flora/flauna which is more common in tw, shenzhen/china is a bit dated ( circa early 90' late 80's in style and photographic techniques but it's cheap)
I believe also places such as japan and korea are becoming popular as well.
pls note everyone, pre-martial photos is common practice in HK and Asia (but the actual wedding photos is also standard practice in hk as well).
also beware of hidden cost such as frames and deluxe albums, it can bump up the price significantly, more important additional photos is at a premium (HK$100 to HK$180 each) thus cheap package may be more expenisive if you decide that you want more photographs, (most local females expect the region of 45 to 80 photographs), thus cheapest package may turn out to be less value than an more expensive package.