Rotary lifts are worth the extra money IMHO. I've used plenty of lifts, and they have always seemed to be the most durable and the most sturdy. Challenger is a fine lift but a slight step down from a rotary. Knock off versions, like we have a couple of at Lash, are the ones that we've had to repair recently for major parts breaking off. The rotary lifts in my bays have been fantastic and are at least 10 years old in a high traffic shop.
I would prefer low profile arms for my home lift, and screw adjustment pads but wouldn't break a deal for me. 220v will operate much faster as well, but this depends on your needs and if you want to go the extra mile for that. Hope you get something that works out well for you.