Handheld Radios - Icom A5 or A6?

This new pilot was rather freaked out after losing one of my two radios
on my first 'real' long trip. Making me an even firmer believer in
redundancy, it is time to get a handheld backup.

I was all set on the Icom A5 Sport (alkaline battery) as this would be
used as a backup. Now I see the A6 Sport has arrived.

Can anyone familiar with these models recommend if the A6 is worth the
extra $40 or so? It's hard for me (an inexperienced handheld user) to
spot the differences online.

Thanks,