i don't quite understand what you're trying to ask.  if you are asking whether higher badges (defense merit - fighting, or freeman - building) offer any advantage to your char?... as far as we currently know, they don't.  they are simply there as milestones.
i guess another way to look at the TA fighting/building... it's basically just a giant group-mission.  you take missions from the king for one-time runs yourself.  we fight this giant mission on TA as a team, hoping that one day (it will be a while) we'll clear the whole island.  who knows... maybe after that, there'll be more to do.
--jason

Thanks jason;

but how effects it my char. to figthing on TA.
Are it considered to can for exam +5% for each defence merit or freeman, or anything else?

Again, Jason is right.  I find it ALOT easier to level on TA.  
Also, the TA army drops VERY useful potions which I use on Larki to move around on god or formidable mode and easily replenish hps (again leveling more quickly and collecting goodies).  Finally, you get credits in the TA supply tent which I use to buy expensive, somewhat rare items that I can sell in market for good $.  
Oh, and for something different to do.  Love that some people complain about the game being "same old" but others complain about new upgrades.  
Can't please all the people...

JCD

money is not everything in this game.  most people prefer to gain experience (and lvl-up faster).  if you have a decently built char, and fight smartly on TA, you can actually get a decent amount better exp there than on larki.  and yes, you definitely don't make as much money there, but you can always get thieves or diggers to supplement your fighter (using market transfers of silvers).
--jason