For every complex problem there is a simple answer..... and it's wrong...
There are elements of truth in your friends broad brush statements, but an equal amount that is wrong or missing. Furuno, for example, who are the biggest in the industry, yet more focused on commercial, are not even in the list. But they have a consumer line that is as complete and integrated as others, if that's what you want.
I think you just need to spend time with all of them, or work with an installer who you trust. Different people "bond" with how different systems operate. Some people find Garmin's single-source charts preferable, where others find it a non-starters. In some areas Navionics is good and C-map will run you aground. And vice versa in other areas. Different system use different charts, so it can be a big factor in system selection.
And while we are throwing around generalizations, here's one to consider.
If you want Consumer Electronics on your boat, buy Garmin,
Simrad/B&G/Lowrence, or Raymarine. By "Consumer Electronics" I mean products that have the latest gadgets and features, work with your phone, socialize, etc. They also need to be updated frequently, things don't always work, and advice like "turn it off an back on again" will solve many problems. Plus product life cycle will be about 3 years start to finish. In a year there will be a newer, better version of what you have, and withing 3 years your product will be obsolete and no longer repairable.
If you want Navigation Equipment on your boat, buy Furuno. By "Navigation Equipment" I mean products that have all the required navigation features, are rock solid in operation, but are slow to have newer features. The product life cycle will be 5-10 years, and you will still have a good shot at repairs on 15-20 year old equipment. It will all "just work" day in an day out.