Looking at the cost of ownership, the MX20 is much higher for each feature added. Wx, chartview, traffic and db updates are very expensive.
You cant beat the size and clarity of the MX20 for terrain, airport features, and other important facets for IFR work. If you dont spend much time there you are waisting your money.
I much preferr My MX20 over the handheld. But I am paying for it severly.
Best,