Hermesaholic,
My 1st H is an Evelyn PM2 Prune color, in clemence leather.
I definitely recommend Evelyn in clemence because as it hangs messenger style, the soft leather kind of 'hugs' and flow with our body.
I also suggest a non neutral color for an Evelyn because it's a fun and casual bag.
If you read through the thread on Evelyn, some have problems with the adjustable strap because it sits uncomfortably on some of the owners.
With version 2, you can carry it messenger style or change it to a shoulder bag , double up the strap and tie one end with a scarf or twilly. Voila, 2 styles in one.
It's also a good idea to get a bag insert to organise your stuff inside an Evelyn because the bag is unlined, and it's north south shape means you may have to dig and search for your items 'swimming' inside the bag.
As for PM vs GM, it depends on how much things you need to carry and remember the bigger the bag, the heavier it is.
Good luck deciding and do share with us your decision