They are both good saws, I have the 744 and have used it almost daily for years. What sets DeWalt apart from other brands is the rack and pinion fence, it's very user friendly and accurate. I’m kind of surprised that other brands haven’t followed suit with that feature.
When deciding between the two you first need to figure out what you need out of the saw. The 744 is a bigger/heavier saw. About the only thing I don’t like about the 744 is that it’s a little clunky loading and unloading every day.
The 745 will rip up to 16” where the 744 will do 24 ½” so if you want to rip sheets of plywood in half you’ll need the bigger saw. Another difference is there is a dado blade throat plate available for the 744 but it is recommended that you "do not" use dado blades with the 745 and there is no dado throat plate available.
The only other brand of portable table saw in that class that I have experience with is the Bosch
. One of the things I like about it is the stand, it makes it real easy to move the thing around. Although the Bosch with the stand is a little bigger then I have room for in my trailer, if this is something that’s going to primarily be in your garage/shop and will be getting moved around a lot then I’d be taking a close look at that saw too.
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