There should not be a technically relevant difference. According to research https://www.reddit.com/r/logitech/comments/xx1sd0/difference_between_mx_master_3s_and_the_for/, there only seems to be a difference in the manufacturer's warranty. In this case, however, this would be irrelevant, as we offer a 2-year warranty for both. The price difference is mainly due to the purchasing conditions.

With battery 🔋 which is charged via USB-C. The battery lasts forever and I use the mouse for several hours a day.

This is a Bluetooth mouse, exactly.

Unfortunately, we do not offer this model for left-handers.

Yes mol, it seems so :D The product actually has the following dimensions: 124.9x84.3x 51mm (LxWxH). Merci for the hint!