I live in Indianapolis. Do you live in Indianapolis? If you live in Indiana, you probably don't live in an area that's very friendly toward bicycles or e-bikes. There's virtually no bicycle lanes in Indianapolis. I've built two electric bikes. My #1 priority for both of them was that it had to be fast because cars don't want to wait on you and the less cars that pass you, the safer you are in the long run.
If you are talking about electric scooters that are commercial and ready-to-use then most of them are going to be very slow with a top speed of 20 mph. One of my ebikes goes 31 mph at 60v and the other goes 35 mph at 48v. I just think 20 mph is too slow unless you live in a city that is friendly toward bicycles. If indianapolis had bicycle lanes, I wouldn't mind buying a commercial e-bike or commercially made scooter.
Pros of commercially made scooters or e-bikes
lockable battery box.....comes with pretty much theft proof design
very easy to use, just switch it on....ride...park it ....then ride again...
Cons of comercially made
too slow for non-friendly bicycle areas...worst feeling in the world is getting your new e-bike out on the road and realize that you are getting your ass kicked by traffic because you're too slow.
might even be too slow for your own personal satisfaction
Expensive...for the same price you can build one of your own that has twice the power and twice the range
Is it possible to actually pedal it? some commercial e-bikes have pedals but are way too heavy to pedal.
Pros of Do-it-yourself
you can make it as powerful as you want
Easy to pedal because it's just a bike with a 15 lb motor on it and some batteries. I can pedal mine at 15 mph easily and I'm not even a strong bike rider.
Cons of DIY
need to make batteries theft-proof or at least some kind of quick-release to take batteries with you
My biggest worry is just theft. I still haven't theft-proof my e-bike yet but I will do that this year. It will only cost me about $80. I just need to buy a lockable box and a piece for my rack and then that's it. I had to buy a chain for it too but I already bought that. If I live in like Seattle, I might consider buying a commercial e-bike because they have bike paths everywhere but here in Indiana, it's just not a bike friendly area. However, if you have some specific plan of where you want to ride your bike and it doesn't involve dangerous roads, I don't see anything wrong with buying a commercial bike. If I bought one, though I'd like it to be modifiable so I can at least upgrade it myself or work on it myself rather than to have to ship it somewhere or take it to a bike shop. The whole reason I got into e-bikes was because I hated taking my car in and getting some outrageous repair bill. I like the idea that I can work on my e-bike by myself and fix whatever is needed. Here is my e-bike if you are interested.