What is the best vehicle magnet mount antenna to use?

Should I buy the 301103 12" magnet mount or the 30113 4" mini mag?
Wilson 301103
12" Magnet Mount
 
Wilson 30113
4" Mini Mag
Easy to install.  Mounts to
metal surface with a
rare-earth magnet.  Transfers
easily from one vehicle to
another.
Portability
Easy to install.  Mounts to
metal surface with a
rare-earth magnet.  Transfers
easily from one vehicle to
another.
Taller. 12 inches high
Size
Shorter.  4 inches high
Highest gain.
5.12 dBi 806-894 MHz
6.12 dBi 1850-1990 MHz
Gain
Lower gain.
2.12 dBi 806-894 MHz
3.12 dBi 1850-1990 MHz
High gain
Pros
Compact, low profile
For some, height might be an
issue
Cons
Sacrifice gain for size
Summary:

Both of these Wilson antennas perform very well and are very portable.  Powerful Signal has
done tests with both and in many situations there is no difference.

If you are doing most of your traveling in a more urban, metropolitan area and need extra
signal strength for the irritating areas where you always drop a call, then the 4" mini mag will
probably do just fine.

If you are in remote, on-the-edge areas then you should consider the 12" magnet mount.  
You will need all the gain you can get to stretch your signal farther.

If you drive an SUV or truck and size and looks are not important; get the 301103 Magnet
Mount.

If you drive a luxury car then you might prefer the smaller, lower profile 301113 Mini Mag.