i cannot decide which guitar processor to buy among these.. please help me out!!!
All of those are very old units. Is there some reason why those are your only options?
Where are you from, what's your budget, current equipment and favoured genre?
Running through:

Engl Fireball
Engl Slanted Cab
Ibanez Xiphos
Schecter C-1 FR Black
Ibanez GRG (on its way)

Boss Noise Gate, Zakk Wylde Overdrive, Boss Tuner, Zakk Wylde Wah.
None of those units are worth $150. It makes no sense that you would be considering any of them unless you are in a special situation that you aren't telling us. Like you live in Timbuktu and that's all that's available.
The me 30 is a really old pedal. For $150, I would be looking at a used digitech rp355, a used line 6 pod 2.0, and a used rp500. I highly recommend the rp355. It has great effects, and good distortion and amp modeling.
Guitars: Fender FSR Standard Strat, Squire Affinity Strat, Epiphone Nighthawk
Amps: Vox AC15C1, Roland Cube 15x, Peavey KB-1
Pedals: Digitech RP355, HD500, Joyo AC-Tone, EHX Soul Food