They all have their pluses and minuses
Personally I run all Furuno electronics even inshore because they are stable, long supported and most trust worthy IMHO. They dont have entry level technology like single band CHIRP, low power down and side scan, etc. in cheap units. However the technology they offer in that stuff (real CHIRP box, 3D sounder, etc.) is the real deal but costs $$$. Radars are the best.. Downside are that a full system tends to be little pricier than others and it takes a little more effort to get set up right the first time.
Garmin is simple to use and has a great fish finder with an array of transducers to match your fishing. Their charts are limited to bluecharts so see if they work for your area. Some people love them, some not so much. Downside is that their radars are not very good and Garmin seems to issue updates like most change their underwear. Some updates have been known to contain/cause glitches.
Raymarine has some nice magnetron radars. Solid state, not-so good. My Dad's 2.2kw ray radar was better than my previous 4kw Garmin. Their fishfinders are pretty good but can be limited on the transducer front. Unfortunately the company has gone through a bunch of corporate changes and had some customer service problems over the years leaving them on the outside looking in a bit. Who knows how the FLIR Raymarine will fair long term.
I personally am not a fan of Navico products (Simrad and Lowrance). I dont think their fish finders are very good, even the CHIRP stuff (at least with the transducers on the boats I have run). Everything looks like blobs to me and it is hard to decipher bait from game. Their 3G radar wasnt overly impressive to me and I am told their HALO radar drops large targets even 6 miles out. On a positive note, you can get good Navionics charts with them and they are pretty simple to use and set up.