Which school is more renowned/known for their sciences?

UBC (as opposed to UBCO) is generally higher ranked than UVic, although both are very good. For what it's worth, UBC has higher entrance standards, so it presumably attracts a few more top academic students. Although I'm a UBC Science graduate myself, one thing I really like about UVic is its cooperative education program, which is top-notch; biology at least. Anyways, if your choice is strictly to be on the basis of international renown, then go with UBC. But I would recommend you consider many other factors, including the academic reputation of the specific science you are considering studying, the size of the school and the city (some people would prefer the smaller city environment of UVic), whether you have friends or family in one city, etc.