Having worked at an Elemis spa, I loved working with the products - so when I came to open my own salon I would have gone with Elemis - but there was way too many with Elemis in my area, so I chose to stock Decleor which I don't regret at all - love the products all my clients love the products.
Never had any issues and even my friend who uses Elemis in her salon commented on how good my skin looks, even she said she loves Decleor too.
I don't think you can lose either way tbh.