Never lived in north or east Wales, but can confirm Pembs lovely. Teifi valley also nice, but different kettle of fish.
Pembs touristy in summer but less than English hotspots. Talk to many visitors and frequently hear Pembs like Cornwall 40 years ago. Accommodation dominated by holiday cottages and similar. Have to book well in advance - many regulars in places like Newport book for next summer as they leave - and not cheap.
Weather much drier and sunnier than north Wales (look at sunshine maps from Met Office for proof) but whole west coat of UK wetter than central and eastern regions - most rain in UK comes from over Atlantic so kinda unavoidable...
Pembrokeshire pop. density low, not much industry or commerce except tourism/agriculture. Peaceful, quiet, average crime rates very low. We seldom lock doors. Not good for those who like city life (Swansea, nearest large town, nearly two hours away by car). Train and bus services not great. Need car.
www.theguardian.com/money/2020/jan/31/lets-move-to-the-north-pembrokeshire-coast-a-place-to-escape-the-universes-ills
Traditionally not many opportunities to eat out, getting better every year but given low population will always be limited. Local produce fantastic - get all our meat, dairy, and most veg and fish locally. Good markets, e.g. St Dogmaels at northernmost tip of county.
undiscovered-wales.co.uk/2020/04/16/st-dogmaels-producers-market/
If in St Dogs, pop into Ceredigion, have dinner at Yr Hen Printworks in Cardigan, new entry to Michelin guide this year. Been there few times, never disappointed.
www.yrhenprintworks.co.uk/
Back on southern side of Teifi in Pembs, nowhere is far from coast, so beaches and walking are big locally. Landscape lovely & varied - coastal, hills, woodland. Fantastic footpath network including of course coastal path itself.
www.visitpembrokeshire.com/
Another thing visitors tell me repeatedly is locals very friendly/welcoming - no "local shop for local people" vibe. Rings true.
www.theguardian.com/travel/2017/may/26/pembrokehsire-out-of-sync-modern-times-unearthed-festival-tim-rees
Like most deeply rural places far from major conurbations transport is a pain. Otherwise would be far more people. Happy with that trade-off myself.
Anti-English sentiment not an issue here. Welsh a big thing in north Pembs, not in south below Landsker line.