So I've been through the CPQ with a number of different characters: Assassin, IL mage, Bandit, Brawler, Gunslinger, and Bowman. I've also studied closely the effectiveness of warriors in rooms 5/6 against rombots. And here's a little analysis of characters at lvl 43 (Allows for use of maple weapons which gives warriors their much needed acc boost).
If you're trading wins against a good team both teams can constantly fight and gain exp from monsters. All of my characters have gained at least 30k exp from fighting rombots in room 5/6. And mind you I've done this as a gunner hitting like 100-300 per double shot hit.
Let's say you kill 100 rombots during those 10 minutes. Which I've been able to consistently do on my characters, (though usually its higher for me). Each rombot kill gives about 244+something exp in a party of 3. So let's be negative about this and say 250 exp per kill. That's 25k exp from JUST the monsters.
So on your win you get 30k+25k exp and on your loss you get 10k+25k. Average is about oh... i dunno.... 20k+25k exp. 45k exp sounds rather well. It's also consistent if you're trading wins.
Also, this does NOT account for ANY exp from the things your party members kill.

so yeah... you can add on another 10k exp at least to that.
On the other hand, if you don't trade wins, yet consistantly win you'll be getting 30k exp from winning, some decent amount of kills from rombots (until the other team starts spamming cancel att). So let's be optimistic and say you kill 50% of the rombots you could have had you not been stopped by cancel att. Meaning instead of 100 rombots you kill 50 (meaning you got 300 points on your own in a non TW -which isn't bad for a level 4X taking on rombots). that's 30k+12.5k exp+ exp from party members kills.
Now let's do a comparison:
TWs:
1) Consistent exp
2) Avg exp for a decent low 4x group: 20k+25k+ party members kills (uninterrupted)
Non-TWs
1) Constantly finding new parties
2) avg exp (Optimistically assuming you always win) 30k+15k + party members kill exp (interrupted often by enemies)
And once you get to the higher lvl 4Xs Rombot killing exp gets much higher so if you're TWs the exp comes at you really fast.
My best is 70k exp from rombots 30k exp from winning for a total of 100k exp in 10 minutes. (This was before family system and no 2x was used).
Make of this info what you will.