Rhino is really slow. But his damage buff is excellent. I personally like Vauban more but as other ppl said not very beginner friendly.
Your top priority should be finishing the star chart und reach at least MR8-ish. A lot of good weapons are avaible then.
Always max you weapons and frames, even if you don't like them. use your platin exclusively for frame/weapon slots
That would be my general advise for a beginner
Edit: Must see for a new player ;) https://www.youtube.com/watch?v=-VuYCLelIO8
It's standard on Fedora already. But I remember first hearing about Wayland many years ago. So, definitely Kudos to the Devs ๐