u have a wonder later on that reduces 80% of the time at lvl 30 so polar in the end is more useless then the brown bear (on later stages)
I disagree. At that level, your L1 polar bear + L30 Timwarp reduces tournament rounds to 1h 36m vs a L10 polar bear which reduces wait time to
zero.
If you play on multiple servers (which most Beta players do), and have less than unlimited time for the game, then cutting 1.5h more off of your wait time can be a huge bonus.
Even for me, with a mid-level TW and only enough to get a level 6 bear, that 48m difference means I can do 3 rounds in 1 day instead of 2 with my schedule. This allows me to do the entire tournament in 2 days, and if I'm smart about it I can use one dwarven armorer on 2 tournaments (and 2 spires)
Some numbers: a polar bear is worth about 5 levels of timewarp which is about 4,000 KP
If a brown bear gives you enough extra troops to do 5 more provinces 5x it'll take about 3 years to get 4,000 extra KP
A moon bear will take 3 years too or 1 year plus a buttload of petfood.
Edit: to be fair a level 1 polar gives half of those benefits, so only 18 months for the other bears to catch up.