Need a New Computing Device

Ailing Device, 2012, graphite.

I'm in the market for a new computer and, perhaps, some peripheral devices. Care to recommend your setup or, perhaps, the setup you long for?

My current setup: PC laptop purchased several years ago when our household desperately needed a new computer at a reasonable price. Machine still supports day-to-day tasks just fine but, man, does it get slow when running Photoshop, etc. Currently no peripheral devices aside from external hard drive.

A couple of nagging questions:

• Better to buy a less expensive "workhorse" and instead invest in a nice tablet?
• Mac or PC? I've had both in the home but, honestly, the pragmatist in me feels no real preference for either. Convince me.

I welcome your suggestions, opinions, etc. Thanks in advance for the thought food.