Agree about the shared right of way. We don't have it, but my parents have to allow neighbours to use the tunnel through to their garden and have given next door neighbours a strip to put their bins on (the land behind both houses belongs to them.) It's a PITA, most of the time. The current tenant of the house next door never puts their bins out for emptying, which makes a horrible mess of the garden, so, inevitably, my dad ends up seeing to theirs as well as their own.
We'll never buy a terrace on a slope, again. Back to front slope is fine - had that, the front of the house was raised up, so the inconvenience of a few steps mitigated any potential problems. Current house has one side slightly underground, which is a damp/condensation magnet and people are always having to reseal where their roof butts against the neighbour's wall.
And I've lived in terraces all my adult life and be pretty lucky with neighbours. I'm not sure neighbours think the same about us, though. Detached is going to be something to look out for, when we move. Not a dealbreaker if it's not as price, location and space for the boys to keep out of each other's hair, quite likely into adulthood, plus a safe enclosed garden, however small, for DS2, who might never be safe out alone. Most of the properties I've seen with a suitable layout are detached new built types, anyhow.