Navcom - handheld VS panel ?

Hello everyone - my first posting here.

I'm in the process of equipping my Earthstar thundergull with avionics.
This is a very light tandem 2 seater.
I was wondering what type of navcom to go with...handheld or panel
mounted.

Panel space is limited , so a panel radio choice would probably be the
Microair. But this is substantially more expensive than handhelds.

What are the disadvantages of a handheld ?
Would you recommend a specific handheld make & model ?

The aircraft does have an external antenna.
I do intend to fly into class C & D airspaces.
I do need intercom.
I do need squelch.


All input much appreciated.

thanks
Pavan Bhatnagar (PPASEL to be)