Danny Garcia might say that Spence is better than Crawford, but I would believe more on Shawn Porter who faced both boxers and IIRC, Porter said that Crawford is the better fighter, so maybe if we listen to this guy, we will have a good basis and we will not be biased.
Yep he should know more about both Spence and Crawford rather than anyone else since he have fought them and never afraid with losses. The thing is he have a reach disadvantages, he and Spence only have difference for 6 cm while he and Crawford have difference for 11 cm. That's why on his fight against Crawford, he fall down because he move to far to hit Crawford and since his position is open, Crawford punch him.