I don't think my 12" is heavy! But awkward.
The 8" is waaayyyy light. The 10" is about right.
Even though the 12" will give you much better views, the 10" is an easy scope to carry around. And fits in almost any car. The 12" is a bit big for most cars. It fits in my Falcon but only just.
If you can get to a shop, try the weight of the 10" and I think you'll find it very managable.
My 11 year old son carries the Clubs 8" around, so that gives you an idea.