I have a biased opinion since i have a MS. As far as a portfueler, its easier but it has the same type of tuning. you still need to tune a ve map. If you use the MS for fuel only you will have a more accurate mixture with changing outside air temps.

here are some pros/cons for both: everyone can add to this really.

Portfueler pros over MS
bolt on
ECU controls idle so you have a factory like idle.
ECU controls daily driving out of boost...no check engine light
with port feuler you adjust only your boost ve map

Cons with portf
No intake air temp compensation, you may have to adjust as seasons change
cost 1000.00
map sensor only ready to 21psi....2.5 bar sensor
map sensor not upgradeable
you will need you own datalogging software
no o2/wideband correction input.
8 injectors more fuel lines

MS Pros over portf
02/wideband correction
intake air temp correction
upgradable map sensor to 4 bar 44 psi
cheaper, whole setup cost 500-600. mine cost me 400.
MS is diy so you can repair it if you break something
MS has its own display if you choose to add it
MS is a growing platform so you can add:
nitrous control
timing control
water injection
knock sensor capabilities
launch control
you mind can be the limit on these
With MS you can tune your Idle and driveability any way you choose
MS has its own datalogging software and ve table tweaking software
only 4 injectors less fuel lines ect

Cons with MS
more building and adding of sensors
slightly more tuning
Cel light that wont go away since the ecu isnt controlling primary injectors.

i am sure there are a few more cons but thats all i can think of

To make this decision for yourself you need to read up on the MS and portfueler.

Now if you go with a used e034 from a member here you can acquire the whole setup for about 500-600. keep that in mind

Terry