what is the difficulty order among EE,EEE,ECE,MCE because i want to take one as my branch in DTU

Both Electrical and Electronics are equilvalent, as in Electrical core subjects will be Machines, Power system and Power electronics and in Electronics core subjects will be Digital, Analog, Signal and system and Microprocessor. However max subjects are common in Electrical and Electronics. So all these are difficult, now it depends on your interest if you like studying about DC AC Motors, Generators or about transmission of power then go for Electrical or if you have interest in Circuits then go for Electronics.