As others are trying to say...if purely after the "deepest" view get the 16 inch...
However, you must factor in transport...
The best scope choice in my opinion is the one that you will use. A 16 would be great but if you only get it out 2 times a year in my mind it diminishes the advantages of the extra magnitudes observable...
Get the one you are most likely to use...I find I use my 2 smaller scopes as often (recently more) than my 12.5 inch...mostly due to time constraints...yes the bigger one is "better" when I use it I just don't get to use it as much as I can/do the smaller ones.
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