re: What is a good portable car jumper to get?

I would advise to get the most powerful and simple unit that you can get. Basic is better.
I bought one of the Stanley units back in Sep. at Walmart that had the built in air compressor, led Light, USB plugs and an inverter with a 110AC outlet. It cost 100 bucks.
The week before Christmas, I needed to use it. The first time. Battery was dead on one of our vehicles in The driveway. It would not start that vehicle for some reason. The computer kept tripping out of the jumper mode and the air compressor would start.
Had to drag out my 30 foot cables anyway and the vehicle fired right up. Luckily, Walmart refunded my money on that POS.

My advice: Get a jumper box that has one damn function.