For digging only, an EX is much faster than a TLB but that is all it can do is dig unless you have a dump truck standing by to take all the spoils as the EX digs them up, you are left with piles of dirt that then have to be loaded a backhoe bucket load at a time with the EX. Put both tasks together having them both dig a hole then load the spoil in a dump truck. I think you will find that the TLB while taking a bit longer to dig will load out much faster than the EX can.
One thing not mentioned in the video is the better flotation of the tracked rig which may necessitate its use in some circumstances also. Another thing I like about an excavator is the 360 degree swing compared to at most 180 for a TLB, this also is handy when digging out a ditch or pond so you can put the spoil back away from the work area.
Both of these pieces of equipment have their strong points and on a construction site, you will see both of them used. For home owner or small landscaping business a TLB is the most versatile and most used piece of equipment, BUT that doesn't mean that we could sometimes need to rent an EX for a day or two to complete a certain task.