Which cruiser line is better?

I’ve heard that other than the tier 7 the German line has all good ships.

I can attest to the opinion the IJN line hits a road bump at the tier 5 and somewhat tier 6, but the 7 is great. I’ve heard the rest of the line is supposed to be good too.Note because of the torps this line plays a bit different. 

Not sure on USN, there play is different style once you get to the Pensacola and lose your torps. It has good guns, but not armored well imo.

Can’t say I’ve heard much about the RU line. Either that doesn’t bode well or not that many people have played them.

I think even most beta players have t gotten to 10 yet, tier 7 seems to be a lot of bot games (tea,s 1/2 bot, 1/2 human) but some full human games too. So may be hard to get highway than that opinions.

I’ve only pushed my Americans and Japanese to Tier VII. My Germans and Russians are at VI and V respectively, but...The Japanese are the best so far with the Germans close behind. The Americans hit a very rough patch at Tier VI but improve dramatically at VII. The Russians are such a steaming pile at V that I doubt I’ll push to VI since I already have the Molotov premium at that tier.

So of your listed options I’d go with the Germans. You get superb guns and keep the knock out punch of torpedoes. The Americans are better gunfighters and have superior defensive qualities, but without torps they are at the mercy of anything that outmaneuvers them.