Sounds like you all had a blast this morning? Wish I could have made it.
I have two young kids and they enjoy sitting on the nose of my 11'2.
When I put my 4 year old boy on the nose of the 10'5 it was quite difficult to paddle. He moves around on the board alot.
I think that having less board is good if you dont have the space.
Both seem to have a longboard feel on the wave. Riding the nose is possible with both.
If I had a quiver of SUPs it would be the 9'8 for big and faster waves for that shortboard sensation,
the 10'5 for the longboard sessions in all conditions without the kids
and the 11'2 for smaller waves requiring less paddling to get on the waves and for the whole family to enjoy.
I more than likely would have the 10'5 but for me its too close to the 11'2 and wouldnt do what I would want it to do.
By all means the 10'5 is a totally insane board and I wish I had one but my kids would be very very unhappy if they couldnt come paddling with me