Aylesbury is good for FTB but not a lot else really.
As PP said, most of it is run down although the new theatre & Waitrose is a step in the right direction.
Watermead is about to have a crematorium built on site. Fairford Leys is usjally on tje more-affordable side but the school is massively over subscribed with residents within 300m not getting accepted.
Buckingham Park is the new estate still being built I believe but last week I think from reading the local paper (The Bucks Herald) saw 2 men shot and a stabbing (murder). Maybe get online & try to read it?
The Hartwell side by The Willows, Stone & Oakwood Park developments are going to be ruined by HS2, as are some beautiful AONB’s such as Waddesdon, Gt Missenden & Wendover which currently are beautiful villages close by.
You need to look online at the HS2 interactive map.
Weston Turville & Stoke Mandeville are currently being extended with new-builds with all of the green land disappearing.
Thame, Princes Risborough, Haddenham as well as Chinnor are far safer bets.