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Gummun said..
...My rationale for switching to Severne would be shorter boom lengths, easier to learn jybes and waterstarts - ,more mauverability? Or would the difference between the sails be minimal for me as a progressing beginner?
The shorter boom length on the older and larger Gators comes predominantly from a clew cutout and not from a different aspect ratio.
The batten immediate above the clew sticks out a fair way beyond the end of the boom. Hence the 'shorter boom length' does give advantage in the practicality of not needing a longer boom and (in theory) some (very small) performance benefit in reduction in swing weight, but I am not sure it makes the sail perform like a short boomed, high aspect sail.
You could argue tall and narrow sails may feel easier to gybe, but they will also feel twitchier when sailing. They won't have as locked in, sit back and relax feel and do you have to be more active in trimming the sail all the time. In any session you spend more time going than gybing and I have never liked the feel of proper short boomed sails (the old old NP RAFs being the ultimate example), twitchy and always 'active', almost fighting against you all the time. Great for that one special session you get once in a blue moon but for the average day just too annoying.
I am not sure you will notice a difference in a Gator performance related solely to boom length. They are great sails quality, price and performance. The idea of one model with changing characteristics from 3m to 7.5m also works quite well.
If you are planning on going out and purchasing an entire quiver from 3.5 to 7.5 then heading towards Gators does make sense, one brand, one model, one 'feel' but wave to freeewave to freeride as the sizes change.
Otherwise, like Mark_Aus says, not sure it makes that much difference either way.