Some of the cheaper ones will take longer to pump from flat, they also burn out quicker.
The cheaper ones run smaller motors meaning they have to work twice as hard to do the same job but in 4x the time it takes a good compressor to do the job.
Ive got a cheap brand that shall not be named worked for the first 4 wheels 5 and 6 on the camper had to run lower pressures for 50km as the motor got too hot and didnt want to work anymore, it was also a 2hour job pumping 4 tires.
Portable is good if you want to take it out of the truck all the time, mine was in a bag and had 12v cords long enough to get from front to rear.