Why heavensward story is considered a better one then stormblood ?

[Seraphor]

What a gross exaggeration. You werent jumping around back and forth between the two conflicts. Want me to outline this for you?

Start - Try to liberate Ala Mhigo. It failed
Middle - Divide Imperial forces by liberating Doma. It succeeded
End- Resistance Redemption where we try to liberate Ala Mhigo again. It succeeded.

So yeah, Im not seeing where this "constant back and forth repeatedly" issue people seem to have lies exactly in SB. I heard the same complaints from a friend who told me this exact thing and here I was expecting oh we would be awkwardly traveling between the two nations solving their issues and its an unfocused mess, but no, the entirety of the Far East section is a one and done deal in the main msq. Now what I do have issues is that the story itself was very ambitious and I wouldve personally preferred they dedicated an expansion for Gyr Abania and another for the Far East so we could get some more world lore like how we got with Coerthas and Ishgard in Heavensward.

You somehow miss the point and hit the nail on the head in the same post.
It's not a "constant" back and forth, but it is split between two different (albeit complementing) stories. Neither Othard nor Gyr Abania get enough development in comparison to Coerthas, and in fact Gyr Abania is mostly one dimensional. None of the Gyr Abania zones or locales are at all memorable, and we miss out on the city proper.

The story is also very repetitive because of this "lets see the same thing happen in two (actually more than two) places" idea.
WoL, Alisae and Lyse arrive in [insert oppressed nation/city/village].
"We hAvE cOmE tO lIbErAtE yOu"
"Go away we don't need liberating"
WoL accomplishes [insert impressive task]
"NoW cAn We LiBeRaTe YoU?"
"Yeah ok."

That happens at least three times, five if you count the individual Gyr Abanian villages. (and come to think of it, there's the Kojin too)

To be fair, Shadowbringers was equally as repetitive, slaying the Lightwarden for each zone, but this was purely in comparison to Ishgard at the time when Stormblood was the contemporary, which had one fully fleshed out plot line that gave the main characters all the screen time needed to give them a full character development arc.
And besides, Shadowbringers does a better job at diversifying the repeated steps and the different locales, with a separate overarching narrative with Emet progressing alongside, which compared to Zenos is virtually classical prose.