Don't know about schools in Devizes, but it's a nightmare place to commute to/from by all accounts. I do quite like the shops there though!
Chippenham - to be quite honest there isn't a primary school I wouldn't be happy to send my children to. Some are definitely 'better' if you look at Ofsted and league tables, but I'm not convinced they tell the whole picture about what the schools do with the children they get.
St Mary's (Catholic) and St Peter's (CoE) are highly sought after. Redland is newly trendy - 10 years ago no-one wanted to send their children there but it's now flavour of the month. My lot go/used to go to Ivy Lane and I think it's brilliant. It doesn't always do so hotly in league tables and has quite a mixed intake, but it is caring, has brilliant, innovative teachers and my gifted and talented children (not my definition!) thrived there and were supported and challenged.
Queens' Crescent and Monkton Park are supposed to be good, as are Charter and Frogwell which both have special needs/learning support units.
Probably the poorest reputation is St Pauls but to be honest a lot of that is historic and linked to the council area nearby. I know children and staff there and it seems to be OK. My own sister in law went there not so many years ago and did very well indeed.
As for the secondary schools, Abbeyfields is only 6 years old and mainly caters for the Pewsham area of town (which has a huge primary school, King's Lodge), and villages towards Calne and indeed Calne itself. Don't move to Calne!
Hardenhuish and Sheldon are right next door to one another, both very good statistics and reputation - Sheldon has the edge but I would be very happy with either. If you live in the town itself you're in catchment for both of these - some of my friends have children at both.
My children are at Sheldon and it is just fantastic. If it's statistics you're into, it regularly outperforms grammar schools and well-known private schools in the county.
It is hot on discipline, the work ethos, rewarding children. Loads of extra-curricular opportunities, great pastoral care.
I agree Chippenham town centre could be more exciting, but we have most day-to-day things. A great farm shop and a few miles away there is a lovely garden centre with kids' activities and a superb local food hall.
We tend to use Chippenham for most ordinary shopping, and have trips to Bath, Corsham, Devizes etc for a slightly different range.
If it's shopping malls you're after, people tend to go to Cribbs Causeway near Bristol or the Outlet Centre in Swindon, but I'm not keen myself.