How much “looking after” do you like/want to do (or avoid) on your bike?
Something like a multilink Zesty is imo a more capable bike for more of the time in the uk that a 5, but is not as robust. If you like to ride, get back and just chuck you bike in the shed, then a 5 is a better bet because there are simply less moving parts to go wrong!
People always bang on about BB’s on Zestys as being some sort of massive issue, but i don’t get it. I’ve spent about £5k on my Zesty, and probably £2.5k last year in riding it (accomodation, fuel, parking, uplifts etc) and yes, i have changed the BB. it cost me £22 and took less than 20min. After a solid year of riding the old one was a little notchy (still turning fine,just a little bit grumbly, kinda like me these days 😉
And when it comes to pure speed, it’s always the rider that matters. On just about every terrain i’ve ever ridden, the difference in downhill pace is measured in seconds between riders and bikes, but the uphill pace is measured in minutes, and 99% of that is the bikes engine, rather than it’s suspension layout!
If you like the 5, you should get it.