I have mostly lived in Texas as an adult and was happy to follow the Astros, largely because I also watched their AA team during some very good years. I also got to make fun to all my friends about 1980 at the same time.
The funny thing is I became less interested in them when they moved to the AL, even though it would have been easier to have an "AL Team." I did pull for hard for them in that World Series. Less so now.
I also have a soft spot for the Orioles growing up as I'm sure a lot of people did in the region.
But yes, nothing supplants the Phillies, just like I would never, living now in Portland, root for the Blazers against the Sixers if we ever get that Finals rematch.