What do you mean by install? Arduino's IDE is nice for some boards since you install the software and everything is ready to use, but that is only the case for

What do you mean by install? Arduino's IDE is nice for some boards since you install the software and everything is ready to use, but that is only the case for some boards. PlatformIO is mildly more difficult to install since it is a two step process: first the VSCode, then the extension. Both steps are easy enough to do and to some people it is preferable since they are already using VSCode. The difference between Arduino's IDE and PlatformIO come down to installing board support and libraries. Arduino's IDE is probably better if you are using Arduino libraries on a board that it directly supports since the installation process will be nominally easier. If that isn't the case, PlatformIO will likely be significantly easier since it supports more board, frameworks, and libraries.