737: Wilco vs. PMDG

... hey & hallo:
Actually I fly most of my times a Posky 737-700 which I really like; I added the Ultimate Boeing Panel which works fine for me, having TCAS and GPWS and all of that stuff.
However, I think about buying either a Wilco or a PMDG 737. As far as the PMDG is concerned I am thinking of the 600/700 NG model.
So my question is twofold:
1.) is either of the both worth any investment (which is not that much, but anyway);
2.) which one is better?
Thanx
WP
Actually I fly most of my times a Posky 737-700 which I really like; I added the Ultimate Boeing Panel which works fine for me, having TCAS and GPWS and all of that stuff.
However, I think about buying either a Wilco or a PMDG 737. As far as the PMDG is concerned I am thinking of the 600/700 NG model.
So my question is twofold:
1.) is either of the both worth any investment (which is not that much, but anyway);
2.) which one is better?
Thanx
WP