I admit to being a newbie at pellet grills. But from what I can tell, they all work about the same. They use an augur and have a fan. They have some kind of temperature sensing device in the cooking area that tells the augur when to feed more pellets. They all need electricity to run. And none of them are cheap.
I assume you are looking for one that is suitable for RV use, meaning you want it portable. I'm not sure any are entry level. They are priced more by size.
I suspect we all will recommend what we have and I am no exception. I like my Green Mountain Grills (GMG) Davey Crocket a lot and I would buy it again. But I also like the looks of that Rec-Tec Mini with the fold up legs. Traeger also makes a portable one, but I think you actually have to remove the legs.
I like the Wi-Fi option that Green Mountain is offering now. If you like that idea, then maybe read up on it at their site or call their tech folks and have a talk.
I also suggest that you look at shipping weight for each one you are considering. Heavy is good as it most likely equates to heavier gage metal (holds heat better), but that also makes it a little more difficult to get in and out of an RV. I know Green Mountain states what the gage of the metal they use at their site.
Make sure to get one with a digital readout for cooking temperature. I also like that I have a meat probe and it connects to the digital readout so I can monitor it easily. This is one more thing you can also monitor wirelessly via the WiFi hookup option on GMG grills.
Also look at the actual measurements of the grilling surface. Some are not all that large. Note the size of the opening and how much clearance you have above the grate. You can still cook a whole turkey on some of these small ones.
* I carry 3 kinds of pellets in heavy duty 5 gallon buckets with gasketed lids from Baytec containers at bayteccontainers.com Part number is NG005PK. You get 3 for $40, incl shipping.
Tim