If you spend hours a day in front of your studio monitors, and find yourself being fatigued at the end of the day, or your mixes are not translating well, you owe it to yourself to get down to your local dealer and audition these monitors. Just make sure they are well and truly burnt in. Very highly recommended.
I find myself torn between recommending the Focusrite Scarlett 18i20 Gen 3 and telling you to look elsewhere. When you claim as Focsurite does “20 outputs of incredible sound quality” I would assume you are referring to the analogue outputs given that a digital signal is simply being passed through. That is why I never thought their would be compromises with the headphone outputs stealing the line output converters, who would? My use case is not the norm, but I am sure I am not the only one who will in fact make full use of all inputs and outputs, only to find they can not use the headphone outputs as well. This is a major limitation and Focusrite along with all other manufactures should be called out on it. Be more upfront with your customers to avoid customer disappointment. Like I said, I would have spent the money for the higher end interface had I known, instead, I have to now sell this interface at a loss, and buy another interface that does not have this same compromise…it will not be another Focusrite.