In my experience the Manjaro config tends to work better on some of the hardware I've tried it on, requiring less tweaking to get it to run properly.
I'll also admit that I can't for the life of me get Arch to properly install with all the tools and features that are normally built-in to desktop environments to work on first boot. I'm sure I can make it work if I give it another try now that I've gotten more used to using Manjaro, but the Arch installation experience is not something I want to go through again any time soon.
I understand that most Arch users will want to decide exactly how they set up their system and all, but for my personal (non-work) machine I just want an operating system that works, allows me to mess with the standard Linux stuff and manages to install itself without me holding its hand. I'd much rather tick a box that says "enable full disk encryption" than manually configure cryptsetup and LUKS parameters. It's just too much effort for what I get out of it.