Either option seems idyllic, but as I age I have to weigh up the practicalities.
A house by the sea is a good option, but it must be far enough away from
undue storm/flood damage, coastal erosion and be in reasonable access of
health related facilities.
I already live in a rural situation, a village in Buckinghamshire UK, with
three small shops, a GP's surgery, reasonable roads to a general hospital
about eight miles away, nearest small market town Leighton Buzzard is
a short bus or car journey of nine miles, and good home delivery options
from three major supermarkets.
As I type, I can hear ducks on the roof, see the odd pheasant strolling
past the window, and watch badgers and foxes at night.
Were I twenty years younger, a house by the sea might be considered,
I have lived by the sea during my working life and enjoyed it, but I guess
I will stay put in this little corner of England's green and pleasant land,
despite our variable weather !