Actually I found the only shortfall with the Klooge Character sheets is the fact that you only have one. You can't have specific character sheets that differ from the standard character sheets for things like Starships, vehicles or robots. They have to fit into the standard character sheet. Otherwise the character sheet is everybit as customizable as GRiP.
With the latest version of Klooge, the only thing I wish it really had was a more mature dice suite. Things are handled differently but they are still handled well.
(If I could figure out how to add a char sheet I would.
)
One other bonus, is that in the very near future, as soon as I figure out exactly how the D20 version does the job, Klooge will have a script to import a PCGen T20 character sheet into klooge.
One other point in GRiP's favor when it comes to CT. Because CT is so inconsistent with what skill levels do it is easier with GRiP's interface to deal with CT skills in GRiP than it is in Klooge. (Still possible but more difficult.) Also it is easier in Grip to handle the miriad of weapon mods required to deal with CT combat. (Only because it is easier to script individual weapons.) Though it can only deal with the firers end of combat. Klooge will calculate range, AC and will include range bands to target. (Either it does in the latest version or it will in the next. Unfortunately I haven't had time to mess with the latest upgrade and implement the changes.)
With CT GRIP has an edge in less graphics intensive campaigns. (Importing a map is a pain but possible if you are careful, you will never be able to do it on the fly in GRiP.) With T20 Klooge edges GRIP in all but cost. (And if you really want them Starship character sheets.) And if you want to play with graphics then Klooge definitely has a major lead.
Besides the tab flipping, Grip has one other disadvantage that drove me up the wall. To allow a character to log into the system the server has to be in listen mode. While in listen mode only chat works. THough the players can access their sheets the Referee is stuck waiting for the log on or has to lock someone out. Now if everyone is running the latest and greatest OS, with a nice clean Broadband connection (or is on your LAN), this might not be much of a problem. But carrier drop offs, crashes and other problems means that at least twice in a three hour session you will need to drop to listen mode.
OH, one other thing, I misspoke earlier I thought you were looking at Fantasy Grounds. Open RPG is free. I looked at it and was less than impressed and didn't find much in the way of support for creating a new game definition. The Docs were definitely lacking. (Same as most of these packages, however GRIP has a helpful userbase and Klooge has both a helpful userbase and active company suport.) When I saw Fantasy Grounds (Which is where my earlier comments about licensing and unhelpful support, were actually directed.) and Klooge the OpenRPG option went out the window. Klooge won out on graphics, licensing options and helpful support.
Fnatasy Grounds has the neatest dice suite of any of the Online Tabletops though. You actually roll the dice. (If I could have CSML, (GRIP, though with a solid manual on it.) Fantasy Grounds Dice mechanics, Klooge's character sheet, interface, and graphics suite and ScreenMonkey's User interface, and connection simplicity, all in one package, it would be THE online tabletop system.