Yes, you can't go wrong with the T5. It's fast, compact and well made. I use mine almost every day and don't regret buying it for a second. I also really appreciate the USB-C port.
Only you can answer whether the 500GB is enough. At the moment it seems to be enough for your purposes, but in most cases you will regret not having taken the larger one in 2-3 years.
The Samsung SSD can store photos on both Windows and Mac without any problems. However, it is important that your computer can read the Sony Alpha 6300 data. This will most likely be the case.
The SSD comes with a USB-C to USB-C and a USB-C to USB-A cable. If you need a 2nd cable for this SSD, I would buy a USB-C 3.1 cable. https://www.digitec.ch/de...