There are very good spring piston air rifle brands on the market, but many rather second rate ones too.
From my personal experience, German-made Weihrauch air rifles are probably the best spring-piston air rifles money can buy, as even the high powered versions are made according to very demanding tolerances. All the essential mechanical components are solidly engineered using high quality steel, and the woodwork of the stocks is excellent. You will not find plastic triggers on this brand.
Weihrauch airguns were sold under the "Beeman" brand name for a long time in the US, and are now sold by Arizona Airguns
, among other.
Quality always makes a difference: Unlike many manufacturers, who simply place a metal or plastic end cap at the back of the spring-piston compression tube, Weihrauch actually uses solid steel threaded units that are screwed inside the the compression tube (see the Weihrauch 77, 97, and 80 series, among other). A weak point of some air rifles is the barrel hinge, which if it is either not properly made or comes loose after years of use will affect accuracy on break barrel air rifles: not a problem with Weihrauch.
Here the Weihrauch website: https://www.weihrauch-sport.de/spring-piston-break-barrel?lang=en
Another excellent brand is the UK-based "Air Arms", both in terms of spring-piston air rifles and PCP's.
Here the Air Arms website: https://www.air-arms.co.uk/spring-rifles.html
Forget about brands such as "Stoeger" or "Gamo"...terrible quality, too much plastic....a waste of money.
A final note about the recoil on spring-piston air rifles: the problem is the double rebound of the spring inside the compression chamber after the shot is fired. This is what makes such air rifles harder to shoot, not to mention the necessity of scopes made to resist such forces. NB - A standard scope that is fine on a 30-06 hunting rifle may not resist the double rebound motion and related vibrations of a powerful spring-piston air rifle.
OK...back to slingshots...