I don't have lots to say really so I don't know why I'm wading in...😂but anyway...
We were going to buy shared ownership when we were looking 4 years ago, but we ended up buying 'fully owned' - although with a 5% deposit and a hideous 40 year term(!) - such is London, I guess.
Some thoughts/chit chat.
If you plan to stay for a while, really can't afford to go the 'fully owned' route, buy a resale (where the prices are better as you say!) and are able to put down a 10% deposit or more, and aren't subject to really high service charges, then I personally believe shared ownership is a better option than to be stuck renting. I hated being at the mercy of shitty landlords!
But if you can scrape together enough to go the 'fully owned' route, I think it's probably slightly preferable? I think it's a valid step to go SO, but you sometimes are a bit hamstrung in a way you aren't if you go the usual route. You pay the full cost in time and energy for all the upkeep etc, but you only actually own a small percentage, and that can really suck. The upsides are that you have a lot more control over your space, no one will be kicking you out or changing the cost or terms of your accommodation, and you're building equity. These are all great things, obviously. I think SO gets a bad rap, sometimes unfairly.
Where are you looking? Have you spoken to a broker about what's possible? We thought SO was our only viable route but when we spoke to a broker we were surprised that it wasn't totally impossible to go 'fully owned'. Sorry I keep putting 'fully owned' in speech marks but I'm unsure what the correct term is.