The Como's upright posture is an important personal preference decision but looking at the Canadian specs I see that Como 3&4s are equipped with 48t chainrings whereas the Vado 3&4s have 40t rings giving th Vados an 'out of the gate' climbing advantage. If the upright position is important to you, you might be able to get your LBS to change the chainring for little or no cost.
Other than riding position, the Canadian Como 3 is sepc'd very close to the Vado 3 and similarly for the 4s. The 3s save money but you are giving up some higher spec components on the 4s; 9spd Alivio vs 10spd Deore, Alivio shadow derailleur vs Deroe Shadow+, 11-36t cassette vs 11-42t, 460Wh battery vs 500Wh, 2A vs 4A charger, etc.
The motors are also different; the 3s have the 1.2e motor vs the 1.2 for the 4s. The 1.2e is said to be designed for more electrical efficiency, i.e. less watts per mile. This graph helps illustrate the differnce;
View attachment 53361
The 1.2e motor will use less power, but it also provides less power to the rider; 400+W peak vs 500+W, a big difference on a hill. The peak power for both motors is developed at a candence ~80rpm but the 1.2 motor starts out higher and ramps up its output more quickly passing the 1.2e peak output by the time the candence hits ~45rpm.
Bottom line? Choose between the Como and Vado based on riding position. Test ride them both and compare.
Choose between a 3 vs a 4 based on the asst level you need, esp for hills. The 4s will have the advantage with the 1.2 motor, wider range cassette, extra gear, and smaller chain ring. Regardless of hill asst, the 4s also have an advantage with higher spec components that should help ease the pain of the extra $. More test rides...
Ride on...