I just hope that the tower troops aren’t released too often and are balanced. What I worry is that the tower troop acts as a 9th card and make all decks too good that no one can really attack.
I think the cannoneer is so good that it can be considered OP. Its only weakness is swarm cards, but spells would easily take care of them. The cannoneer basically solves the problem for cycle decks and decks that depend on counterattack by making the impossible defense. (ex: splashyard, miner, hog, royale giant). Each of these decks are good against swarms because: splashyard (a lot of spells and splash cards), miner (fast cycle + delivery), hog (firecracker), royale giant (mother witch). The cannoneer is too good against most of the troops.
Other than DPS, the important difference is the maximum sight mentioned. The other cannoneer will be able to hit the heavy tank pulled by a building, however, other fellow troops may not get hit by both towers. I think it’ll be still good because the fellow troops can’t do anything if the tank dies.