Marc,

Be aware that companies count days differently. Some count Day 1 of trip when you leave home & day 2 when you arrive in your port city. Others, count day 1 as the day you arive.

We have done 5 river cruises using both Uniworld & Tauck & enjoyed them both very much. Balconys are so small & narrow they should not be a deciding factor between lines. All river boats are the same width to get through the canals. You can't keep the doors open as the mosquitoes will kill you.

I think an important factor is who offers the vox box. Uniworld has it but Tauck does not. Also, the size of the excursion groups varies. You shoould aim for no more than 20.