I actually believe the vase does affect the smoke. I notice that since smaller vases hold less water and ice they tend to get warmer faster. On the contrary larger vases can hold more ice and more water which does not get heated by the warm smoke as quickly. Larger vases tend to produce a cooler average smoke over the session than a smaller vase. IDK maybe you won't notice it but I do. Ultimately when considering size you also have to consider where your trying to fit it, do you bring it around with you, and is it wide enough for you stem.
Other than that as long as its thick glass it should be fine wherever you get it from