There are very few reasons not to go w/the 3g/4g radars. The only problem is that it ties you to one brand of electronics B&G/Simrad/Lowrance/Hummingbird (same parent company). The traditional stalwarts in marine electronics dont have a product that integrates with their systems yet (Furuno, Raymarine, Garmin).
If you select a:
Raymarine rader you need a Raymarine MFD (display unit)
Garmin radar you need a Garmin MFD
Furuno radar you need a Furuno MFD
Navico radar you need a Navico MFD (Navico is Simrad, B&G and Lowrance)
As for other electronics (wind/depth/AIS/speed/gps ++) all the brands you list use the NMEA 2000 standard for exchanging data (Furuno, Raymarine, Garmin, Simrad, B&G, Lowrance).
You will still find old equipment using older protocols like Seatalk, NMEA 0183 ++)
Although, I was surprised to learn that Simrad displaced Raymarine as the standard electronics suite on Beneteau's!
Not surprised at all, Navico (Simrad) is currently on of the leaders in development of marine electronics.
Another factor is of course the in prices Beneteau can get from different vendors.