Is it really Bows or Guns??

[Tonka]

Again, depends on the scenario. A bow isn't better than a knife if your assailant is leaping at you from across the room. The big disadvantage of the gun is it's reliance on ammunition produced by a functioning society. Scavengable ammunition will be scarce in the UK. So it doesn't take much imagination to think of post shtf scenarios where a bow, using simple DIY ammo, would be more advantages. Just as it would be easy to think of situations where a gun would be best.
A nuclear sub isn't better than a home-made catapult when your hunting rabbits.

I have an 1853 pattern Enfield cavalry carbine, and a few books on making black powder. This may go a little way towards the best of both worlds. Although I have had no practise making the powder, and it's not without it's dangers.