There are many choices when you want to replace a controller. A basic one that's similar to what you already have is about £20. One with an LCD and 5 levels of assist is about £40. A very nice one that gives a nice ride, allows you to choose the power you want and makes your motor smooth and quiet is about £70.
They nearly all work directly with the motor - just plug in and it works, though rarely, the expensive controller doesn't like the sequence of the wires in the connector, so you have to swap some around, which isn't much of a problem when you have the bullet and block connectors on the controller end of the motor cable, like you have.
Pedal sensors can also give problems, where the wires sequence in the connector doesn't match, so need to be swapped around.
Your motor probably doesn't have a speed sensor in it, so any LCD will not show the correct speed unless you fit an wheel-magnet type speed sensor. They will show the correct speed without one, but only when the motor is giving power. When you freewheel down a hill, it'll show zero speed because the motor won't be turning.
You have to choose a controller that gives the power you want considering the constraint of how much power the battery can give. The maximum power is written on the controller, but the only thing that has a real meaning is the maximum amps. If you want more climbing power, you can choose one with higher maximum amps. Generally, the higher the maximum amps, the bigger the controller. You also need to consider the size of the controller, bearing in mind the constraint of the location where you plan to put it.
The more expensive option controller is normally dual voltage 24v/36v or 36v/48v. This gives the option of changing your battery to 48v when it needs replacing. That gives you 30% more torque, power and speed at the expense of a small loss of efficiency.
To summarise, there are three levels of cost and functionality. All of them will probably require some attention to one or more connectors. Choose one that gives the maximum current and voltage you need.
IMHO, it's worth spending the money to get a sinewave KT controller with LCD, speed sensor and throttle from Topbikekit or wherever you can find one the right size, current and voltage you want. It might be worth getting the 10 magnet PAS too if your present one has 12 magnets, since there can be compatibility issues with those type sensors.
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