There are two questions that, for the sake of peace in the land, are best ignored.
One is, "Which is better, Windows or Macintosh?"
The second one is yours - but let's wade right in.
There are good arguments for turning off the PC every night.
If you use it heavily, turning it off nightly clears out garbage that has accumulated in random access memory during the day, giving your computer a fresh start in the morning.

Putting the PC to bed saves you money, especially if per-kilowatt charges in your area are high.
By saving energy, you are also reducing pressure to build more power plants and increase the use of polluting fuels.
But let's be honest. Leaving the computer on is convenient. Why sit through a long bootup each and every morning?
And you want to talk wear and tear?
Every time you turn on your PC, its parts are subjected to power surges. Its hard drive has to crank into action.
All that could shorten the lives of various components, though, to be fair, you are likely to get rid of the PC before that happens.

Some experts try to straddle the leave-on turn-off question by advocating the use of power management to spin down the drives and turn off the monitor when the computer is off duty.

The power management utility, though, is temperamental and can interfere in nasty ways with use of the computer.
My approach is to keep my computer on for two or three days, then give it either a daylong or nightlong rest.
However, I do turn off my monitor at night, even if I leave the rest of the system running. The monitor is responsible for most of the power the PC consumes.