The key thing is to realistically assess how well an electric bike fits your schedule. If you mostly ride around the city, charge at home, and don't take long trips, then switching makes sense. You'll definitely save money on maintenance - no oil, spark plugs, filters, or transmission. But about the battery in the cold - the reality here is less rosy than what you see in ads. Almost all electric motorcycles lose 30-40 percent of their range in freezing weather, it's just physics of lithium-ion batteries, not a problem with any specific model.
Look at the options that have battery heating - it really helps, but it bumps up the final cost. And here's another important thing: charging in cold weather takes time, you can't quickly bring the bike from minus to plus temperatures. If you have the chance to keep your bike in a heated garage and charge it there - great, that solves half the problem.
It's hard to say about specific models without knowing your budget and what region you ride in. But overall, my advice is: before you buy, find someone in your city who owns an electric bike and ask how their battery actually performs in winter where you are. What your neighbors experience is worth more than any specs you'll find online.