Both GREAT lights!
The closest comparison would be the Mac's Tri-EDC vs the Pocket Triple Moddoolar Slim. The Moddoolar can be "Lego" configured in various ways, so we have to pick a config for it.
Mac's is a little smaller on the bezel head end, and maybe the tail end too.
The Moddoo on a single battery, which is the closest comparison, is about a couple hundred lumens brighter OTF. Not a huge amount when comparing lights this bright, but it does have the edge.
Carry-ability is going to be very similar. However, the narrower diameter of the head of the Mac's will appeal to those who like narrower lights for carry.
Both are very easy-to-use clickies.
When it comes to battery life, and battery configurations, this is where the Moddoo Triple shines because of it's Lego-ability to swap different battery tubes and tailcaps for various battery configurations and size/shape.
You can choose your battery life with the Moddoo, by choosing a battery tube that gives you the run time or brightness level that you want.
For example, the Moddoo can run on onecell, or two cells. If you run two cells, it gives you much more brightness and better regulated run time.
With a battery tube that holds either a 18650 or 2 x 18350, you can choose the higher lumens output of two 18350 cells that give about 1300 lumens OTF and a 20 minute run time on Maximum, or a single 18650 which will give about 950 lumens OTF and a longer run time on Maximum. Both can be used in the same tube, so it gives a lot of flexibility.
The Moddoo tube selections are very broad. You can choose the Stubby configuration for one 18350 which is only 2.75" long, and that would be MUCH shorter than the Mac's Tri-EDC.
Or you could use the 2 x 18350 battery tube, or the 2 x 18500 battery tube, or the 2 x 18650 battery tube. You can get the Slim tailcap, or the fluted Triad tailcap. You can make it clicky with a McClicky switch, or you can make it a twisty with the ZeroRez or ZeroRez shorty switch alternative. Etc.
The options are very wide in the Moddoolar product line.
So, there are a lot of differences.
It depends on what you want from the light.
Both are superb pieces of work for what they are intended to do.