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The window restrictors are more useful for childrens bedrooms where you want to vary window opening but also stop small children from opening the window. In lower security situations they can be enough.
There's really no middle ground. Sash bolts are 101. Centre bolts (brighton fasteners etc.) as well, more for show than anything else since they're easy to defeat. Even then there are security issues with sashes, especially at ground level in London.
Airhead
What's the best middle ground? Sash bolts that you unscrew are a fiddle when you want to open the window and you have to remember to put the things back in. Something like https://www.reddiseals.com/product/sash-window-restrictor/ looks reasonably secure although maybe harder to install?