Arva are a long standing French brand, been making beacons for 20+ years.
Though never been popular outside France (which is odd as they make good kit).
The new Arva neo is apparently very good, and a little cheaper than the BCA T2. If I was buying a new beacon it would on my short list (along with the Mammut Element, BCA T2). If you are getting a new beacon then any of the modern digital beacons with 3 antenna's will be good. Multiple burial features are often used to differentiate models, but unlikely to be of real world use - better to go with a simple interface IMHO.