My DS has ASD (original diagnosis also refers to Aspergers) and ADHD and has just finished his third year at uni.
I won't lie, it has not been an easy road BUT he has done it and overall it has been a really positive experience for him. He's loved his uni city, really enjoyed his course, produced some fantastic assignments (even if he didn't always manage to get to all the lectures...) and should achieve a strong degree classification (result due any day!). He's also coped with living away and made friends via a sports society for a sport he is passionate about.
My top tips for any parent of a neurodiverse student would be:
1 APPLY FOR DSA!! It's a lifeline. It's non means tested and can fund anything from equipment to wellbeing support or academic support tutors. Honestly DS's support tutor was the game-changer between coping and not coping.
https://www.gov.uk/disabled-students-allowance-dsa
2.Look at what the unis offer in terms of support for neurodiverse students - not just academically / welfare wise but socially too. DS's uni had a club specifically for ND students plus another ND support group which he found useful.
3.Be pragmatic. And practical. Look at courses at unis that are not too far away - DS said from the outset that he didn't want to be any further than an hour away from home. As a result, he was far enough that he had to 'go away' but near enough that he could get home (or I could get to him) at short notice.
4.Look for accommodation that's going to suit his needs and be realistic about what is going to work and what not. For example my DS has major food sensory issues and there would literally have been no point in considering catered halls - he'd never have eaten anything. He would also have struggled sharing a bathroom. So it was self-catered ensuite all the way.
5.Really really encourage them to join clubs and societies where they might meet like-minded people. Flatshares are a notorious lottery - DS had no major issues in his but didn't make any friends either - all his uni friends are from his sport society.
6.Be realistic. Try not to compare your ND DC's uni experience with that of a gregarious, neurotypical student who's out socialising every night 'smashing it and loving uni life' etc etc. Yes, lots of students have a full on social uni experience. Lots of them actually don't. The best uni experience for your DS will be the one that works for him.
I hope that helps. For what it's worth, I would consider supporting him in moving to a uni where he has to live in halls initially, but perhaps have the home uni as a backup if things don't work out. Good luck to you both!