I just checked the Sim-Wings scenery on my machine. The landside textures look perfectly fine and crisp to me with beautiful modelling. It’s absolutely fine and I don’t feel like things are missing there, since I won’t ever see it close up anyway. Are you certain that you didn’t accidentally look at V1 screenshots when comparing landside textures? There are no landside animated vehicles in both sceneries. And for airside vehicles both use the same Asobo standard stuff.
One other thing in favour of Sim-Wings is they try and emulate the passive-reflective taxiway edge lighting, which a lot of Spanish airports have (meaning there’s no actual light emitted, it’s just a reflection). It’s not perfect but it’s at least done in a way that you see a difference. Ini didn’t care for that and placed standard Asobo light bulbs.
To me the only thing better in the Ini offering is the more detailed terminal interior modelling. For all else, Sim-Wings wins I think. Especially the ground markings, I just had another look and compared both… They are so much more accurate in Sim-Wings.
So I guess if the check-in area is improtant to you, then by all means buy the Ini offering. But for things relevant to aviation, Sim-Wings is clearly better in my opinion. You can’t get wrong there.