I really wanted to like XFCE, but the tiny tiny window grab area for resizing is just too damn frustrating.
This is by far my favorite way to resize and I don't know why it's not an industry standard.
I use this so much once I found it, this solved my frustration with the tiny resize border on the window itself.
This setting can be found in Settings > Window Manager Tweaks > Accessibility > Key used to grab and move windows: Alt
And so I moved on to Mate.