Choosing an ECU/MCU for a vehicle [closed]

I want to choose a main MCU/ECU for a vehicle design. That vehicle will have lots of sensor datas coming through from other ECU's (like engine ECU) to this main ECU. That sensor datas will be sent with CANBus, but also ethernet will be used for the ECU that will give GPS destination to our main ECU. I want to make a list of features that this ECU/MCU must have. For example:

• This MCU/ECU might be 8, 16 or 32 bits. But there will be lots of datas coming, so 32 bit would be a better choice. In case of an interrupt, with a 8 bit ECU/MCU, the task might be left unfinished.
• MCU/ECU should support Ethernet and CANBus interfaces.

etc. So for such a task, what kind of ECU/MCU should I choose? Or what kind of features the ECU/MCU I will choose must have?