"I played a bit Panzer General on PSone, and the similarity between both games is that they use an hex map and have different type of unit."
I have no idea how similar they are, as I only played one, but the designer said in some interview that playing Senryaku was what inspired them to make the game. If you compare Panzer General to anything SSI did before that game it is a huge difference, so there was obviously something important they picked up from somewhere.
Panzer General units entrench every turn they sit idle, in a city or elsewhere, so they get a defense bonus, that you can grind down using aircraft and artillery if you have the time to prepare an attack properly, or you can send in engineers that ignore that bonus. It makes the game more interesting because you must always counter it, but as long as you do it is not likely to slow you down much.
I do not know about the PS-version of Panzer General, but on PC at least the front never felt very static to me. You usually have to rush across the map at almost full speed every turn or you will get a minor victory at best.
Panzer General is definitely one of my top-three games of all times and I quite frequently go back to play it again. But I never won the campaign and I mostly prefer the early, smaller, scenarios.
It's fun to know that their are at least trying.
Check this out:
episode 1
https://www.youtube.com/watch?v=fJ_3zn2iyqc
episode 2
https://www.youtube.com/watch?v=7bZohXuOkQg
What I like about the game is the simplicity.
A game that starts big like
https://www.youtube.com/watch?v=dHnwBiBr6b0
does have a lot of dissapointments.
Because players need to be eased in. With every new game, don't assume that they played an older version.