What would you do? DH has the option to get sinovac through work or Astrazenica through the national program (we're not in the UK).
Sinovac plus points: shorter dose spacing (only three weeks), seems like with Delta variant the second dose is the key one so he'd be protected more quickly.
Sinovac negative points: no idea how well it works against delta variant, can't find much info whereas AZ definitely seems to work after 2 doses. Also its not approved in UK, EU etc so vaccine passports may not be so easy in future.