Hi Scott, and welcome
I don't play PG but a french player gave me those informations :
Scale :
PG 1 hex = 200 m, 1 turn = 15 min
L! 1 hex = 100 m, 1 turn = 5 min
In the two games, infantry is platoon-sized (30-40 men).
Vehicles : platoon-sized for PG (3-5) / 1=1 in L!
Artillery : 1 battery (PG) / 1 gun (L!)
L! covers the years from 1914 to 1941 (including the 2 expansions). WW1 (L!), Russian Civil War, and other theaters as Chaco (IM) Spanish Civil War, Poland and the start of the Blitzkrieg ... (RW)
Complexity : It seems that L! is a little more difficult. (Artillery is detailed in L! and more detailed in Infernal Machines. It gives something very accurate).
According to me, once you have understood the way it works, it is not difficult.
In PG, a lot of details are included in the rules. In L! there are maybe more details, especially for vehicles and airplanes (dogfights above the trenches are possible) but no rules concerning command while it is a key point in PG.
Graphism : I prefer counters from PG (
I prefer L! ones, I dislike "3D" view. By the way, there are 2 versions of Central Powers counters. We'll discuss again about them next time if you want.)
Maps : it depends but, generally, L! ones are better, CoA rulz !!
I liked L! games I have played. But I didn't like the poor movement allowance of infantry
(Infantry has 1 PM per movement phase - there are 2 movement phase in a turn. WW1 is not a war of movement but is relatively static. That's the reason why there are tanks. The goal of L! is to make us discover the new weapons [it is subtitled "Tactical Weapons Innovations"]).
I hope it will help you. It's more objective than subjective because it is a PG player who said that, and he is not a active Landships! player. If you want to know more, don't hesitate...
(sorry for my english ) Arnauld