Define better?
If you mean that the graphics power and the visual quality is better, then your friend is right. PC games *can* look a lot better than PS games depending on the quality of the PC. For this reason, a lot of people argue that PC games are "better". Playstation hardware is simplistic and cheap compared to a good quality rig, so yep - a PS game will have significantly lower quality visuals compared to any decent gaming PC.
PC also has mods, which allow you to download hundreds of new bits for a lot of games, such as new levels, new areas, new zones, new spells/weapons, updated visual quality, edited zone design, etc. Because mods are being made almost every day, it can be hard to run out of mods to download for PC games, so effectively whereas PS games "end", PC games can last a lot lot longer.
PC games can also sound better if you get a good soundsystem set up to your PC. However PS can also have good sound if you have extra speakers set up to your TV.
However, consoles have a larger userbase, meaning that there are generally more multiplayer matches going. It's not that noticeable, but it's something to consider.
I think the one way in which I'd say that some people find PS better than PC is the controls. With the PC you have to learn to use a keyboard and mouse, which isn't that difficult, but is a bit more complicated than using the good old PS Controller. A lot of people have problems with PC gaming because of the controls. But then again a lot of people don't, and many even prefer the PC controls, so it's hard to say.
Overall, I'd argue that PC gaming is more complicated, but more versatile. I would agree with your friend.
-Nih