Standard decoders mean that you can control motor and one or more auxilliary/function outputs (for lighting, smoke etc.). These are NOT sound decoders. Choose based on size, motor power output, and required outputs.
Zimo standard decoders are probably the best available for fine motor control and offer a variety of CVs to assist in tuning outputs to get the best from your models.
Ask if you need help choosing! YouChoos holds stock of most of these decoders.
Standard Decoders (Motor + Functions)
Plugs / Connectors
Above are shown the connector types that come as standard on those decoders, but if you need a different connector adding then this can usually be done for an extra £4!