Well, TM isn;t bootable, & you cannot test it in advance like a clone, it may or may nov work to get you back to where you were, but frar more time involved than a clone.
Wilst the TM master Pondini, also recommends a Clone besides.. & even the great one has been stumpted on TM a few times.
I understand, if it works.. it works, but the problem is when it doesn't. :)
Cllones can be tested ahead of time, TM may or may not work when needed, & if it does it's far more time consuming than other methods of backup.