Met with a couple who raved about Tunisia
last year - but both spoke colloquial French and admitted that made a big difference.
I'd plump for Malta
if you're restricted to those two choices, and if you want a local contact to investigate options for you please let me know and I'll pass on his email
But do check our the difference in your insurance
beyond 15 degrees - you may well find whilst the premium will increase, the lower cost of travel to mainland EU or Turkey
, plus lower cost berthing, might more than makes up for any increase.