I agree that Tower Control is a lot better than Splat Zones. It's less because "I do well more often in that mode" and more because of why that is. Splat Zones is just a flawed mode from a design standpoint. If you've played King of the Hill type game modes in other games, which is what this basically is, typically when you hold the zone or hill, the area should become harder to keep under control, so that the hill will keep switching sides. In this game, there's only one zone, two spawn points that don't move, and a central mechanic that runs opposite to the kind that would support a game mode of this type.
The more ink you have down, the harder it is for people to spot you especially if you have Ninja Squid. You have more freedom to move. The only time people can kill you is if they carpet bomb the area or otherwise try to ink it to try and draw you out so you're actually visible, you have an Echolocator, which good luck if your team doesn't have someone with that special, or the enemy themselves pops out, but that's usually when they're about to kill an unlucky someone, possibly you. The timer ticks down at a rate way faster than it has any business doing so, such that all people have to do is really take the zone once, and hold it for about a minute before the match ends half the time. A half decent team that gets the area covered efficiently will be able to hold it down without any synergy or communication. The advantage for those who have the zone is greater than that of the people who are trying to take it and that's not how the game mode works.
Tower Control to me is a more proper Splat Zone. What Splat Zones would have been had it not just been a game type that runs so opposite to the core mechanics of Splatoon. When you have the tower under control you're on a narrow platform with minimal cover that makes you really vulnerable. In order to actually win the team has to work together to keep at least one person on the tower while simultaneously escorting it by moving forward. Tower Control is a dangerous escort mission while Splat Zones is a leisurely "defend the fortress."
The one thing about Splat Zones I'll concede works well enough are the maps where there are two zones to simultaneously control. Port Mackerel is the best map in this sense because of how far apart they are so it becomes more difficult to keep control of both at the same time and some team coordination is likely needed, not that there is any due to the lack of matchmaking with friends nor a voice chat feature.