Got this one during Prime Day for $80. It's $90 right now.

Enough juice to start diesels.

I like that it has a built-in voltmeter, so you can tell right off the bat if a car even needs to be jump started.

It also is small enough that you can put it in your bag and take it outside with you as a portable charger. It can charge your phone at least 8 times.

Also I'm not sure if they're still doing this but it (later) came with a free 12V air compressor. So now if I ever have a flat I guess I can pump it back with air.