This is seriously a tough one. Both are my current favorites and this is a dream mega fight for this era..it simply needs to happen. At this point and overthinking it I would lean ever so slightly..by a hair..Crawford. Spence proved an awesome backfoot last out but with respect to Mikey I need to see that against a full fledged and traveled welter before seeing it as effective v Crawford. Spence does much better inside work I believe..which also puts him there and as has been said before he tends to keep that head high. He does a bit of pausing great point and can be observing his work in spots. On comp I go Spence too. And another great thing with both is I think they have genuine 'mean' streaks..solid finishers and build on leads and damaging work rather than coasting on it. Spence may be calm cool collected but he and Bud like to put in some hurt-work. Man, this is a tough one to gauge . I just see Crawford as the more 'fluid' of the two. He's shown that instant shift, from stance to attack mode over and over and the more comfortable all around boxer. Of the two I can see Spence feeling the urge to rush. The urgency that is a double edge sword to press forward should the rounds increasingly go against him..where Crawford can be a little bit of a showman and uses the ring very wisely. All of it. He'd be advised to keep his tongue in his mouth though less he want it lopped off courtesy of a few Spence uppercuts. Equally Spence will do well to keep primary focus on a determined Porter. I think the natural size may be negligible and felt Crawford to way to long to move up to 147. Both are big big for 147 with room to expand. Bit random on this one but really needs to be made. Ask me tomorrow and Spence for the win .