As Allforcats said, they all can provide that wow factor depending upon vantage point. This is a broad generalization so take it as such: The topography/terrain of each of these towns and hence their "feel" is a little different. PA and PT are more "hilly", Sequim tends to be more of a plain of flat farm land or at least it was farm land before the the building boom there!
From many driving points in PA and PT, the hills can both provide for, as well as obscure, those views you're after. Case in point: I like mostly hilly towns rather than mostly flat ones so we live in PA. Our home is hilltop with an unobstructed view looking straight in to Mt. Angeles. An awesome view for morning coffee! The downside is another hill "behind" me mostly blocks my view of the Strait.
Most of the views in and around PA tend to be of the Olympics or the Strait and/or Vancouver Island. FWIW, for me a non-mountain view "wow" is standing atop the pier tower (in downtown PA - near the science center) on a clear night and looking across the Strait to the beautiful twinkling city lights of Victoria, BC with moonlight highlighting the snowy peaks of Mt. Baker! Hint: bring your binoculars. Sequim views tend to be a "aimed" a little more towards Mt. Baker and the San Juan's (at least from Dungeness) but once again depending on the angle you can get awesome views of the Olympics from Sequim as well. PT provides a different angle yet as it's more of an eastward/northeastward facing town out on a "point" of land.
You asked about driving in to these towns. Driving in to Sequim and then PA (heading west), you'll have mostly trees and hills to your "left" with occasional peeks of the Olympics. But, you'll see Mt. Baker, the Strait and Vancouver Island below you to your "right", at least on a clear day! You drive "down" the hill as you go in to PT, so you'll see (depending on which way you're looking) Fort Flagler across Townsend Bay and then Whidbey Island in the distance to your "right".
So why not visit them all and see which "view" makes you personally go "Wow!" the most? It's about an hour and a half drive from PT to PA (with Sequim "in the middle"). Easy day trip with lots of time for stopping and looking. While you're in PA (late spring, summer and early fall when the road is open) take a detour from PA up to the park and ranger station at Hurricane Ridge. A guaranteed "WOW!!!" view on a clear day.
Of course this time of the year it's not uncommon for the mountains to be cloaked in rain or cloud cover which will negate those drive by views you're seeking.
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Port Angeles vs Sequim vs Port Townsend
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