Electric buses in the form of trolleybuses seems like the better option than either of these, although I do agree that battery buses beat hydrogen every day of the week.

Batteries are cheap. Installing lots of copper lines for trolley buses isn't. That's why trolley buses are pretty rare. Old idea, didn't really take that well. There are a handful of cities that have them. And they've had them for decades. Most of those cities now also have battery electrical buses to service all the areas where the cables don't go. Expanding the network of cables doesn't seem to have a very high priority. Installing chargers (in depots mostly) is much easier and cheaper. And it's not like batteries are that expensive.

With battery prices trending to 50$ per kwh, a decent size bus battery of 250kwh would cost about 12.5K. That's manufacturing cost, not purchase cost. But it drives the point home: long term batteries are going to dip even further. Far below 50$/kwh. It will drive down the cost of battery electric drive trains for everything with wheels to far below that of the traditional setup with ICE engines. And they don't need expensive fuel to run. Or a lot of engine maintenance and servicing.

Currently tens of thousands of electrical buses are produced per year. Most of them in China. Which is of course where they have lots of battery factories. It's a rapidly growing industry.