So you said every day pocket carry for iphone.
Does that mean you need to be able to survive the worst longest iphone consumption day?
Do you want to recharge your phone whilst in your pocket?
Let us do the math. How long does your phone last now, and how long does it need to last? Your iphone X is 2716mAh. For long complex reasons use 2/3rds rule so your iphone to fully recharge needs 3/2*2716=4074mAh to fully recharge. So the 6700 is 1.6 recharges. So if your iphone X lasted a given amount of time, would adding 1.6x times again to the day be enough?
For a phone, a daily carry in pocket, then shape may be a factor. The Slim 5000 is a pocket type shape and it is a little over one full recharge. Is that enough?
I really doubt you need the physically much large 10050, you will get nil benefit for an iphone X.