For value for money it has to be Widend. The only downside to Widend is that there is little to cater for the children if the weather is poor. The children's play area and swimming pool are both outdoors - there is a small games room for the children if the weather is poor - slot machines, pool, etc. and the children are allowed into the club house but not up to the bar.
Given good weather it is an excellent site and very central for Torquay, Paignton, Brixham and Totnes. There is a large children's play area at Goodribgton Sands and also the steam train to Dartmouth. The site itself is spotless - you could eat of the shower block floor. There is a discount for membership of either the CC or C&CC, not sure which one and also stay seven nights and one night is free.
Whichever you choose I hope you have a good time and enjoy yourselves and hopefully the weather will be kind to you.