If you can quantify such things, which isn’t exactly a science, the Syro-Malankara Church is most likely the most “pure” ritual Church mainly because they are the Church that was most recently reconciled with Rome. This isn’t absolute and I am sure you can find parishes of the Syro-Malankara Church that do some interesting things.
The whole idea of “latinization” has a long and storied history. it isn’t just regarding rubrics and externals. The internal structure of various sacramental rites have been butchered and replaced with Latin forms: the Maronites currently use the Tridentine form for Absolution and have “vows” inserted into the Crowning ritual, etc, etc. These are the current books in English, the Arabic “revisions” that have been released recently are even worse - any reference to Biblical imagery in the Crowning ritual has been removed - poor Abraham, Sarah, Rebecca, and Jacob. The Baptismal liturgy is a shadow of its former self, aka the Short form was shortened and thats what is given.
Ramsho/Vespers or Safro/Orthros/Lauds in a Parish? Try the Novena to the Sacred Heart and Benediction of the Sacrament.
Then there is the spirituality and theology - or lack thereof. You will be hard pressed to find many Maronite clergy who can tell you anything substantial about Ephrem, or Jacob of Serug, or Isaac the Syrian, or Maron, or John Maron, or anyone else really. They will, however, be able to tell you the entire life story of St Therese or the Cure d’Ars in intimate detail. You’ll hear a lot about transubstantiation and original sin and validity/licitness and lots of other wonderful scholastic things - unless they are a fan of Rahner, de Lubac, or Chardin, of course.
To be blunt, it is all a farce. There is no restoration, its all smoke and mirrors. And the hierarchy in Lebanon is more than happy to play their violins as the ship sinks around them.