Who has not heard MS Amma's Rangapura Vihaara! Of Course great. But TMK is as good and certainly there at the top. I have heard several versions of this great Dikshitar's composition and the best I have liked is that of TMK's. I would not compare legends. Each is great.
A doubt, can TMK's musical acrobatics come anywhere near the bhakti bhava of the likes of MS??? Every instrument incl keyboard also produces a range of notes,, soulful devotional rendition is different 🙏🙏