I went through same of the thought processes mentioned in this thread when I recently replaced my fuel lines.
Current lines had crimped on fittings from a non-marine hydraulic shop.
I'd always thought that type of fitting best but it makes fixing problems while underway more difficult - as in this case. Also, as mentioned, the fittings weren't stainless. The hydraulic shops I've been to all say stainless is too expensive and they don't stock them.
I followed my mechanic's advice and used marine barbed flare fittings.
Also ran Trident 365 fuel line which is A1-15 rated.
I looked at the heavy "blue hose" which is probably better but is very stiff and was $15/foot.
I'm not sure what's best.
I suspect the option I went with is easier to repair but the $15/foot hose is less likely to need that repair...