Also, usually thicker = better shielding from noise and better physical strength to avoid breakage of the conductor inside.
Rock Cables are decent but prone to breakage over time. Simple solution is to open the plug ends and re-solder if it looks severed.
I have used Fender cables a while ago. The one I got had a tremendously long life. No real noise issues.
Best cables I have used are Monster cables. Pricey but low noise and very low impedance and hence no loss of low/high end in signal.
Btw, breakage of the solder joints do happen in most cables over time. Learn to re-solder and always check your cables the day before getting on stage. Also, the thicker the cable, less flexible it is. So don't wind them in tight loops when putting them in your bag.
-- My current rig
Guitar: '98 MIJ Ibanez RG520 QS w EMG 81/60
Amp: Laney LC15R Tube, Fernandes 20W SS
Pedals: MI Audio Tube Zone Overdrive, Boss OD3, CS3, MT2, HM2, DS2, CE5, DD7, TU3, Beta Aivin DD2 Delay, Dunlop Crybaby 95Q, Stranger Vol Pedal, BBE SupaCharger
Others: Yamaha RBX 374 Bass, Yamaha MM-6 Synth, M-Audio Fast Track, Shure SM-57, Heet Sound E-Bow Plus
Wanted(pm if selling): EB VPJr/Boss FV500L,Ibanez w Original/Lo-Pro Edge