Had the Slackline Ti 26 and the older Soul mk3 26.Currently have a mk1 Switchback.
I think the new Slackline has slightly more aggressive geo and 142×12 rear and is a quality bit of kit.
The one thing I’ll say about Cotic, is that I still miss the feel of the Soul. It was really comfy and soaked up all the trail chatter. I’ve just bought my wife an XS Soul…and pretty envious.
I also find their customer service impeccable. It feels like everyone is treated really well and not just if you’re one of their mates.
If you’re after more aggressive trail…slackline. If more trail/xc…soul IMO.