I think if I’m honest it depends on what you use your garden for and where you live in the country, and the size of the patio area which dictates the best seating for you.
If you’re the sort to have a coffee out there, maybe sunbathe, maybe a meal on your own or with partner, and have a small patio, then a small dining or bistro set is likely all that’s required
If you’ve space and you entertain a lot, then of course having large comfortable seating is going to work much better.
As said, we have three three seater sofas in a u shape, and also seperate a dining set, dining table and seating for ten, with proper chairs. Both rattan.
But in non Covid times we socialise and entertain a lot. We have the space, we live in the south east, so the climate is good, and in the spring summer and early autumn we spend a lot of time out there. When it’s warm and dry most of our meals are out there, many evenings, and we have our friends round regularly.
A small cast iron bistro set wouldn’t work for us. Wood needs to much maintenance. A good rattan I like the look of and it’s so easy to manage, it’s out year round and I just give it a hose down and it’s good to go. The cushions are in a large cushion box. They are thick and about two inches deep so mega comfy, hence why we are all comfy to stay out there for long periods.
I’m ok with it not being to everyone’s taste. Because quite frankly I don’t socialise with the sort of people who would be weird about our taste in garden furniture , so it’s highly unlikely they would ever score an invite and be forced to see it..😃