PS+ is a no brainer. 2 or 3 free games every month for what? £4ish? Generally one big(ish) title, a PSN title and a shared PS3/4/Vita title. it also gives you discounts and offers in the store, online storage and other member benefits.
GTSport is really really good. I wouldn’t ever trust the review of someone who played a game once. it’s a 72GB game. You barely skim the surface in one evening. Online racing is great and rewards good clean/fair racing. so helps if you already have a bunch of mates who also drive clean.
There’s a massive in game livery creator for the cars, race kit etc. and heaps of tuning options if customisation and creating is of interest. if not you can still customise everything using the designs others make “public”
The DLC is all also free and there’s a lot more coming.
10yr old sounds about right if he’s mature enough to play fair online. My 8yr old has just started playing and is 25% through the license challenges and still learning the ropes. She’s never played a driving game before so it’s a steep learning curve and is finding some of the technicality needed to get times down frustrating. She’s no way ready to race online yet.
Driveclub looks nice plays alright for an arcade racer but I found it fairly disappointing depth wise.
Wasn’t a fan of the DIRT series on PS3 so haven’t tried 4 or Dirt Rally on PS4.
If you’re after a great arcade (non clean) racing game GTAV is one of the best ever made IMO. not sure how you feel about that. But mute mics and it’s actually harmless. Campaign. not so much. 😉