A lot depends on what features you are looking for, versatility, portability, cooking steaks, burgers, etc. Here are my thoughts on the subject, we carry a Cuisinart Dual Blaze propane grill in our coach, overall it works ok, but I would not recommend it, primarily for 2 reasons, you almost need 3 hands to fold / unfold the legs, and the heat range runs from hot to incinerate, there is no low or even medium heat option. Also when this question comes up the Weber Q series seems to be the most popular choice out there by a long shot.
Now having said that I also have a couple of other portable-ish propane cookers that are worth talking about, the first is probably the most versatile, it is Captn Cook Ovenplus,
Amazon.com it is a combination pizza cooker and top cooking flame grill, it is semi portable with a lug-gable handle on the top, though it weighs about 35 pounds. I suspect this thing was invented for some special purpose in Asia and has been rebranded as a pizza / steak cooker. There are various youtube videos that show it in action. As to cooking the BEST steak I also have an Infrared high heat propane cooker, they are offered in various models priced from about $100 -$1,500, this is the one I have
Amazon.com It is great for steaks, burgers, etc., cooks them better than the Ovenplus as it gets a LOT hotter and will quickly sear a steak, where the ovenplus is more like a conventional broiler. The down side is there is no way to put a pot, etc. on it to easily cook side dishes. Don't be fooled why the ad photos, while it does have handles, I would not exactly call it portable as it weighs in around 27 pounds.