Yep, I'm actually a 2/3* person right now. That dosn't stop me from thinking - Should I choose to use Divine Avenger or Sudaruska when I am eventually a 5* player?
Gran Faust is marked off my list because of the risky charge attack.
Triglav is marked off because I prefere Stun over Freeze.
I don't know whether to pick Divine Avenger or Sudaruska.
Which one should I attempt to get?
Nono, it's good to plan ahead. It's better to find out what you want early than have to recraft stuff after investing in other gear.
As for the two swords, it depends. A short answer would be that DA outdamages and outspeeds Suda in most respects (2/3 of targets), but that the Suda is normal type so sustains a regular damage against everything. The charges are up to you really; DA has a three pronged shooty charge that bugs out if your back is against teh wall, while the Suda has a basic face-smashing, double-hitting mega-stun that KBs everything in the world.
Obviously, I prefer the Suda charge, but I'm a fan of KB. The DA charge does KB as well but relies on the projectiles hitting them to do so, and only covers a small arc in front of you, while the Suda targets a radial area.
For some heavier reading on the subject, Bopp and I discussed the two swords at length here:
http://forums.spiralknights.com/en/node/41144
(Note that this thread is rather old and some points may be outdated. For one, the Suda charge now hits twice, and does a lot more damage than it use to)
Finally, although the damage differences exist, I also feel that there's a redundancy issue involved in discussions such as these, and that even though the Suda is essentially out-dps'd, that it arguably doesn't actually speed up your kills, due to a hits per kill factor. If this holds true, then you could choose Suda (should you wish it) without having to feel like you're "taking the bad, slow route". At worst, you'll have to swing once more on high hp enemies or in 4man parties; it shouldn't actually slow down your run times.
Again, for some heavier reading on this subject:
http://forums.spiralknights.com/en/node/68061
(This thread uses FoV and Brandishes as an example, but Suda/DA apply just as easily)
Ultimately, it's really up to which you prefer. Imho, even if one was drastically slower than the other, is that really a reason to abandon a weapon that you prefer? Try and choose your sword based on how much fun you have, or how much you enjoy playing with it. Worry about optimisation later, when you have more time/money and can craft everything you need anyways~