I would definitely want a lower ratio or PG model when it some to Spinners and jigging for any length of time, they are harder to use in higher ratio's compared to a high ratio overhead.
A few thing to consider would be can you make do with the higher ratio and have it double up as a top water reel?
What line and capacity are you intending on using? for reel deep stuff on the knolls around White and Mayor for instance you may need the 14000 capacity.
You can do both tasks with either reel but it is like anything - having the right tool for the job makes life easier.
For example I took my 20k and 18k to the islands - the 20 was for jigging but also rigged up for a spare..popping with the 18 is a breeze, the 20 was very hard work in comparison.
The 10 is a very nice sized reel for NZ casting and shallow to intermediate jigging, grunty enough to beast fish with but a bit smaller so it can be used all day...or a good chunk of it.