do not expect huge performance numbers with the Pentium G3258 processor (20th anniversary), really this is a low level / budget SKU.
i3 i would refrain from commenting as like millions bench mark exists on how they perform.
Generally Speaking That is lot dependent on GPU you use.
In Short:
For gaming i5 is ok with an high end GPU( lot of games still don't use multi core , etc )
But for Vid Editing i.e Rendering it is high cpu oriented task in which a processor like i7 would be very helpful and will be fully utilized.