If you’re still weighing up the options @ArialAnna, these would be my thoughts
For a start, what is your budget as thanks to its shorter commute, Sevenoaks is pricier, your money will go further In Tonbridge. There is a swimming pool in the Health centre along with roller skating etc.
I’m in one of the villages surrounding Sevenoaks. I’m biased but I prefer Sevenoaks. Yes it’s prettier. The shops might not be plentiful (Tunbridge Wells and Bromley are much better) but then the shops in Tonbridge aren’t great either & are pretty downmarket. Sevenoaks does have a (few) higher end stores as well as a Marks, Waitrose, Aldi, Tesco’s and Sainsburys (which seems pretty enough to me!).
Tonbridge used to be the poor relation but is far more demographically mixed than it used to be. It’s a nice town with a historic centre and some nice properties. It does have more of a rough reputation than Sevenoaks. I’m not sure there is a great deal for teenagers to do (my DD2 goes to school there) but then Sevenoaks in that regards isn’t dissimilar. Both however are pretty safe.
Tonbridge does have more schools as you’ve said. If you’ve got daughters & plan to go State then Hillview is a good Secondary school. If you have boys then you have less great options, the mixed sex Secondary who’s name I forget & the boys Secondary (can’t remember what that’s called either) don’t have great reputations or a great track record when it comes to results.
Sevenoaks Secondaries are pretty mixed. Only one child from DD2 (Year 9) Primary went to Knole. It’s a very big school with a not great local reputation- it has improved its results over the last 5-10 years so I think much of its reputation is based on its historic performance. Trinity has a much better reputation (and performance stats) but it’s a Faith school and takes 50% of its intake on non Faith applicants. It’s very over subscribed and only goes out about a mile on non Faith offers. It’s situated on the outskirts of town near Seal. Wrotham (Wrotham is a village on the outskirts) is also a good school but also over subscribed.
Sevenoaks (imo!) is better for going out. We’ve a lot of restaurants and nice pubs. There’s also a small cinema in the Stag theatre.
Happy for a PM if you want anymore details.