Macs are good, easy to use and relatively quick - until they get hot and chop processor speed, but a laptop contains almost the same hardware, just in a plastic case instead or some shiny aluminium...
The only thing you need to decide on is what software you want to use. I grew up using Adobe Premiere, starting out with 3.0 and now on Premiere Pro CC.
Premiere Elements is a good little product for less than £90 and automates lots of the workflow, supports the Hero7 and provides lots of the transitions, hyperlapse, variable speed and other effects that everybody seems to apply to every action video these days... You will be a 'Tube guru in literally minutes...
Ideally you want 16Gb ram and an i7 processor to edit 4K, but it will run on less, it just gets a bit laggy from time to time.
Tell your stories and share your memories in creative ways. Have fun transforming your video clips into great-looking films with automated editing and step-by-step guidance. It’s never been easier to edit, create, organise and share your videos just the way you want.
www.adobe.com