Having shot Eley (Superbs & Olympics), Hull (Pro Ones, DTL 300 & Sovereign) and Gamebore (Evo, White Gold & Black Gold) I have found this:
Superbs are a decent cartridge, price went a little too high for my liking so switched to Olympics, kills were perfectly acceptable, issue came when my regular stockist couldn't guarantee stock.
I find Pro Ones & Sovereigns too punchy so tried Pro DTL 300's, soft cartridge with good killing power but expensive if you have to pay the full RRP
My normal stockist now do Gamebore cartridges and I was offered the chance to try Evo 24gm and White Gold 28gm, I find both cartridges to be smooth with excellent killing power and I now use these at every shoot I do. I have shot Black Gold's but only in a fibre and these were very smooth and had excellent killing power but I am more then happy using Evo & White Golds. Since switching to Gamebore I am proud to say I am now a brand ambassador for them and am more then happy to let anyone try either the Evo or White Gold if you see me at a ground.
But with most things in shooting I suggest you try different options and settle on the one that works best for you like I did and then you will choose Gamebore :biggrin: