Delighted with my switch!
In 2019 I replaced Raymarine MFDs and radar after 14 years since OEM installation. One screen had gone snowy then progressively darker, and the GPS had me 50 yards up on the shore when transiting the Bay River cut between Pamlico and Neuse Rivers.
I asked my mechanic and the electric installer he recommended about manufacturers, and they both recommended Garmin. Of course I also read the marketing material for Raymarine, watched Garmin and other promotional videos, talked to electronics guys at retailers, too.
I bought the Garmin Touch Screens - 1242 for the upper helm and the 942 for the lower helm, and that has worked out great. Sun glare makes having the larger screen on top worth the money, and the 942 (biggest I could fit in the same space as the former Raymarine C8) is plenty bright and clear there. I chose the Garmin Fantom 18" radar, and am very pleased with that. Yes, the "bird setting" really does show birds! But that's not why I bought it. The boat trails and target enlarger on the screen make identifying targets much easier, and it's safer. I'm completely delighted with both MFDs and the radar.
I kept the old Raymarine autopilot controller and the older transducer. Both work great, and the sonar readings from the older transducer on the Garmin MFDs are outstanding.
So, that was my process of picking a manufacturer and the outcome. I elected to buy less expensive MFDs than Garmin's latest and greatest at the time MFDs, as functionality and maps were the same for my needs. But, I spent $500 more on the radar to get the newer radar technology, partially for safety - it uses only 40w transmitting microwave power over our heads instead of the much higher power of the old technology. Plus, the functionality of the new Fantom technology - similar to new tech from Raymarine, etc., does have better resolution and enhancement features.
This is just one boater's choice. I'm sure many other TF members made other choices for very good reasons. Enjoy doing the research and making great decisions for you and your boat!