I agree, if it's a good deal vs the CRF I would take it.
Big advantage: it's tubeless.
Since 2018 I and my groups have accumulated 1000s of kms on half a dozen 2018 rental 310s in Morocco which as of last month have individually clocked up >60,000 rental kms. So that's nearly a quarter million miles.
Thanks Jay B for the plug – latest Morocco gallery here, fwiw, with loads of 310s. You will see they've been adapted with locally made bashplates, crash bars and barkbusters; all prove their worth each time we use them.

If it suits you, the 310 will be loads more fun (or more secure) on good highways than a CRF and it's OK on the dirt. At 6' 1" I'm actually quite comfy. Much will be down to tyres of course. On every tour there's a short stretch of boring road where some insist on pegging it; last month's record: 142kph.
The biggest problem I find is standing up; the tank cover splays the knees and it's not sustainable (let alone with no risers and on narrow pegs). I only stand up when I need to or to stretch the legs but I bet a CRF will be better.

Economy wise, 85mpg (30kpl) is pretty standard for us; one heavy rider leaving it in 4th resulted in 70; as low as it gets. (I don't know if JMo is talking USmpg). That adds up to a good 340km to a tank.
I hear a 300L will get nearer 100mpg.

As mentioned, some had breaking sidestand lugs (new frames!) but even last month one was bending the pivot tab, leaning lower and lower. These are all 1st gen 2018s + this could be the way heavier renters mount and dismount. Another blew out it's shock oil, but by that mileage it made little difference ;-)
I'm amazed no USD forks have blown.
Various dashboard warning lights play up now which annoyingly means the ABS flips from both wheels to front only. Dust on sensors, I was told. Full ABS is fine on the dirt for the speeds we do. Neutral is hard to find, but for hard-pressed rentals I'd say they match a Jap equivalent for reliability and durability. Hats off to Indian manufacture!

Initially, much depends on what you've ridden before. The 310 looks big until you turn the throttle for the first time. But getting back on one after a week on an 890, brakes apart I found it easier to handle on slow dirt for no other reason than it was a whole lot lighter.

Now the engine's proven, I sometimes I wish BMW would spin off a 21/18 '310 Rally' or 'Adventure'. How hard can it be? It would be less awkward on the dirt, but lose out on all-day tarmac or ripping through the canyons.

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Morocco Overland 4 (2025) • Trans Morocco Trail