From the techpowerup relative performance, if rtx 2060 is at 84% , 3060 is at 100% based sa kanilang review.
--------------------Rtx 2060---------------------------------Rtx 3060
core---------------- 1920------------------------------------3584
memory-------------6Gb------------------------------------12Gb
memory type--------DDR6------------------------------------DDR6
memory bus---------192 bit-----------------------------------192 bit
bandwidth-----------336 GB/s--------------------------------360 GB/s
Bus interface---------pcie 3.0 x 16------------------------------pcie 4.0 X 16
Architecture-----------Turing-----------------------------------Ampere
Again IMHO, depende kung saan mo gagamitin. May malaking advantage ang higher memory sa triple A games to avoid stutter at higher speed bandwidth ng kaunti. Iyong pcie 4.0 x 16 looks promising although hindi naman siya ganoong kalaki difference sa ngayon kumpara sa pcie 3.0 x 16 maybe in the future games-sana.
Again depende pa rin yan sa CPU, Memory, PSU, MOBO at cooling solution, kung madedeliver nga ba nila ung ibinabato ng GPU without bottleneck.