Don't spend "tickets" [coupons] on weapons that you can buy with coins! Save up for the Shotgun pistol instead. But do get it, because it's a good weapon and a nice choice to have available for your loadout! (I only use it occasionally, but keep it loaded up with top Mods.)
Witch broom is kind of popular because of high damage, but know that it is different to use from "normal" weapons, with a delay before it fires each shot and wonky aim. You do get used to it, but it will feel wrong to begin with.
(I'm spending thousands of coins on weapons I don't want, just to get coupons for the special ones that can't be bought! But then I already have a lot of weapons and don't really Need anything more.)