Better is a very subjective matter.
Better in terms of execution: Games that are originally on mobile ported to pc, the games interface is for mobile originally hence the port on pc is not as optimized for pc controls.
For example: yu gi oh duel links, flappy bird pc, temple run pc.
Better in terms of income for the developer: Pubg mobile has become more popular than the pc version thus tencent is pushing more content to the mobile version because the number of players are bigger in mobile.
Better graphics: depends on your PC and mobile comparison.
For example: genshin impact – to get the highest graphics quality will require a pretty high end phone, which will have better quality than the low settings on PC.
however, the max settings on PC still has better graphics than the max level a phone can reach.