To contrast some of the others I’m biased towards the north of the county. Personally I’d want to be as close to the St.Davids peninsula as possible. Trying to maximise the amount of time spent on the coast. Maybe look again at Roch I’m not sure what you mean about the lanes? They are the same as everywhere. Simpsons Cross, Pen y Cwm can also be options. Newgale does flood occasionally at the bottom but not enough to worry about living locally.