Will this 10ft cable and 6ft both charge the new s20 and s20 ultra at 25w super fast charging, not normal fast charging but super?

yes, it is compatible with Samsung galaxy s20 ultra "super fast charging" as long as you use the original wall charger.

What is the data transfer speed of these cables?

The data transfer speed of this cable is 480Mbp/s.

Does this fast charge an iPhone XR?

Do not think this is compatible with the iPhone XR. iPhone XR uses a lightning port while this is a usb c cable. Here's one with lightning to usb A https://www.amazon.com/Anker-Premium-Lightning-Certified-Chargers/dp/B07D9C8NP2/ref=sr_1_3?dchild=1&keywords=anker+lightning&qid=1596780838&sr=8-3 Here's one with lightning to usb c https://www.amazon.com/Lightning-Anker-Charging-Certified-Supports/dp/B07XYY6Q34/ref=sr_1_19?dchild=1&keywords=anker+lightning&qid=1596780894&sr=8-19

Compatible Devices	Laptop, Smartphone, Tablet
Color Name	Black
Batteries Included	No
Batteries Required	No
Brand	Anker
Manufacturer	anker
Item Model Number	A8853
Model Year	2020
Special Features	Fast Charging, High Speed
Size	6 ft
Cable Type	USB
Product Dimensions	180 x 1.2 x 0.68 cm; 40.82 g
Item Weight	0.09 Pounds

Anker Powerline III USB-C to USB C Cable Fast Charging Cord 60W Power Delivery PD Charging Compatible with Apple MacBook, iPad Pro, Samsung Galaxy S10 Plus, S9 S8 Plus, Pixel and More 6ft Black

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