PIC's are programmable microcontroller chips made by Microchip Inc. PIC's can be programmed to do timing functions, but they can do many other things as well.
555's are dedicated purpose timer chips made by several different manufacturers. They have no intelligence, they are strictly analog electronics.
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PIC Microcontroller which means Peripheral Interface Controller. PIC Microcontroller is originally developed by General Instrument's Microelectronics Division.
4eyes
In general, personal preference and experience is what it comes down to. There are some PIC's that have built in RF systems; I don't believe there are any 8051's with this capability.
Atmega is IC produced by ATMELPIC is IC produced by MICROCHIP TECHNOLOGIESboth these IC names are used as a prefix for their microcontrollers
There are many tradeoffs that must be considered to make a proper choice, neither is better in all cases.However many projects just use personal prejudice (oops sorry, preference) to choose as they are lazy (oops sorry, it takes less work).