>>29538738SMD has a lot of improvements, but it is not a strict upgrade from EoS. Gameplay is better in terms of controls and friendly AI, you can ignore the quiz results and instead choose your pokemon, the music is good, but the game suffers from a slower plot and questionable changes such as removing IQ skills and replacing random recruitments and missions with a finite number of missions where you can recruit all pokemon from gen I-VI.
Skipped GtI because of limited Pokemon available, the dumbing down of gameplay, lack of difficulty, the inability to do more than one mission a day, and limited selection of pokemon. The story might be worth a view, since I was relatively satisfied by it, but it doesn't hold the game. GtL was more like a homework assignment than a legitimate game project.