As someone who has done that exact commute the better part of a decade (although on a non-powered bike) and limited experience with e-bikes (getting one for a family member) here are my thoughts.
By bike route you are looking at 20 km each way (40 km total), with a very large climb (SFU Burnaby is on top of Burnaby Mountain; 1200 ft elevation and the West End is at sea level). If you take a quieter route (e.g., the TransCanada trail - my preferred winter route), then you are looking at even longer distances and even more climbing.
I can only surmise that you are looking at an e-bike to help with the volume of climbing.
Due to the nature of the route, battery performance (both total capacity and number of charge cycles) will really be important as you will be pushing the battery range of most bikes. Depending on the capacity you may have to re-charge at SFU prior to heading back. Either way you will be cycling the battery at least once a day. High-end batteries will be rated for around 500 charge cycles, so this means you will get at the very most 2 years out of a very good battery pack.
Not all e-bikes are however created equal in terms of battery performance. The battery is often the most expensive component, and the easiest way for manufacturers to cut costs. Some manufacturers may cheap out on capacity (meaning you might not make it to SFU). Others may have higher capacities, but opt for batteries that can sustain fewer total cycles before losing substantial capacity (meaning a very costly replacement). Other manufacturers may put in high quality batteries in that have both capacity and can sustain a high number of charge cycles. You will need to do your research here.
Finally, you may also want to consider mixed-mode transport (e.g., bus or skytrain) with a regular bike or even a folding bike so you do not have to worry about finding rack space on the bus or skytrain as another alternative.