Well i prefer my simple AVR (arduino) microcontrollers. I can simply do more stuff with then than a netduino (main reason: netduino is dead-slow in the microcontroller-world) and i love all the Interrupts on the AVR microcontrollers. Every PIN can generate an Interrupt, even if its configured as output-pin (Software-generated interrupt). All the timers, comparators, ADC, USART....
IDE: Atmel Studio 6, based on Visual Studio . You can use Atmel Studio 6 for Arduino Boards too (with all the Librarys).
Well, the question is, what do u wanna create/make?
I do a lot stuff with sensors, so Interrupts and Fast-Code is more important for me. Actualy, i only used the Ethernet-Port-Network stuff of my Netduino Plus. For the Rest it just hadn't the speed or the memory.