Until we get an all-inclusive app like Mac users have in OpenEMU, it seems we're stuck mashing up multiple emulators separately or using Libreto/RetroArch to set things up on our own. PC users have been begging for a nice emulation setup with a competent GUI for years, but it seems that our dreams may soon become reality.
There is a nice frontend in the works for PC users called Snowflake. It is actively being worked on [you can contribute to the project via GitHub], and definitely a project to keep an eye on as there is an alpha version slated to be released sometime soon.
There is also a frontend project for those who use RetroArch called Phoenix. The link goes to their GitHub repository where you can follow or contribute to the progress, but it also hasn't been officially released yet.