Over the years I have gone through a few, for whatever reason the quality isn't always great from a product that really needs to be good.
I recently picked up a new one, after the previous one snapped multiple times towing in Cuba for almost 300km in the rainy season.
This one is called Speed Strap, I picked it for a couple of reasons, it has a relatively small pack size and instead of looped end actually has a daisy chain sewn into it. This means you can easily make it a size that suits the situation you are in.
They are available in various lengths and widths depending on your needs, I found this on Amazon and it came quite highly recommended. I find 15-20 feet works best
In the past I have used other brands, mule tape and even cable locks to get me out of jams, all worked as required but for them to work you need to practice a little.
Towing a motorcycle with a motorcycle isn't as easy and obvious as it may seem and it should be a skill that is practiced prior to needing it. Try it on smooth ground first to understand how it will feel, how your motorcycle will react if you are being towed or are towing.
It can be quite a task to get moving smoothly, then slowing down can be unique for each rider, using the bike at the rear to do the braking to keep tension on the tow strap is imperative to a smooth tow. Also not riding over the line as you maneuver corners might be more of a challenge than you think.
I could write a great deal about this but sometimes a visual just works better and the best video I could find is this one
Any questions don't hesitate to ask