I think the most important features that everyone is looking for when upgrading a tower or when buying it from the market is to see how much this tower could do damage whether this is a physical damage or magical one and this is what we all look first and then you look at fire interval to see the speed of this tower.
Look at damage and see how much this tower could do is essential as a tower like Slime Lord has a very low damage so you have to consider this while adding this tower in the field and you have to look at it and see what is the other feature of this tower as its damage is low so it can do something.
Other thing that makes you do not buy a tower or don't use it that its fire interval and when it is high and this tower is slow so I think most of us don't use this tower so you have to check fire interval for a tower or look for a solution to its slow like using a Gear Grease or upgrading this tower.
For me the priority is for the tower fire interval as I don't like to use slow towers as most of levels have bloodlings which are super fast and they need more than fast tower to be used so I look for fire interval first then I look for a damage of the tower and as I have said if I have to use a slow tower then using a Gear Grease with it.
