Sorry for the delayed posts even though these were held almost a month back.
April 15, 2012
Sri. Sangeeta Kalanidhi T. N. Seshagopalan (Vocal)
Sri. Jayshankar Balan (Violin) & Sri. Ram Sriram (Mridangam)
List:
1. Bhairavi Varnam
2. Siddhi vinayaka - Mohana Kalyani
3. Chalamelara Saketarama -MargaHindolam?
4. Sri Chamundeswari Palayamam - Bilahari
5. Entamuddo - Bindumalini
6. Sri Satyanarayanam - Shubhapantuvarali
7. Yarerangana - Hindlam
8. Kalyani (RTP) - with Grahabhedham and ragamalika Rigitgoula, Ranjani, Atana and Sindhu bhairavi
9. Jagadodharana - Kapi
The RTP in Kalayani with grahabhedham and ragamalika is the highlight of the concert.
-----
April 21st 2012
Sri O.S.Thyagarajan (Vocal)
Sri. Mullaivasal Chandramouli (Violin), Sri. Trivandrum Balaji (Mridangam)
1. Kalyani varnam
2. Entharani Tanakenthaponi- Harikambhoji
3. Padmavathi Ramanam - Poorvikalyani
4. Sanatana Paramapavana - Phalamanjari
5. Endheikii - Mukhari
6. Sankarabharanam w/Grahabhedham (Kharaharapriya, Thodi and Kalyani).
7. Bantureethi - Hamsanadam
8. RTP in Kedaragoula (Pallavi: Devi Sritripura Sundari Dayapathi)
9. Eppovaruvaro
10. Ramabhadra rara - Ananda bhairavi
11. Vinayakuni vale brovave - Madhyamavati
Both are amazing concerts. Only thing in the case of TNS is the accompaniments are not that established (US based artistes) and that is the real difference in my opinion.