Yes I would choose Martinique. You can sail to
Grenada and back to Le Marin easily in this time period. In November many
anchorages are almost deserted. The Grenadines offer some very nice anchorages and good snorkeling.
Provision well in Martinique especially wine and bottled
water as it is much cheaper and much easier there at the Leader
Price supermarket which has a
dinghy dock. There is limited
provisioning in the Grenadines. There are good supermarkets in
Grenada but they are not close by.
Wind and
weather should not be a problem. Have a great cruise!