The 7 a is 6.3" while I came from a 6.7" device which I found still too small. 7" sounds about right for a pocket device, 13" good for a tablet. Haven't tried a 15", that one will be probably a bit on the heavy side.
Thanks -- I don't believe in buying expensive hardware for a sacrificeable personal device. Which is why I lag model-wise, my new Pixel 7 a was 335 EUR which is borderline acceptable.
You might want to check out GrapheneOS, a security-focused alternative ROM for Pixels. It's minimalistic, easy to install and has been painless so far.