Two different Interpreters

I studied this music, Mozart concertante for violin and viola, this semester. When I first brought this music to my teacher, she said my playing is too romantic. I was kind of confused that how I can interpret this classical period music correct. So I start to searching for the answer and I found this two different interprets. I usually liked Bashmet's playing but not this time. I like Oistrakh's playing much better. It was really simple, clean, well combination with violin and viola. It just sound like Mozart to me.

David Fyodorovich Oistrakh (Russian: Давид Фёдорович Ойстрах), David Fiodorovič Ojstrah; September 30 [O.S. September 17] 1908 – October 24, 1974) was a violin virtuoso who made many recordings and was the dedicatee of numerous violin works.
His recordings and performances of Shostakovich's concerti are particularly well known, but he was also a performer of classical concerti. He worked with orchestras in Russia, and also with musicians in Europe and the United States. The violin concerto of Aram Khachaturian is dedicated to him, as are the two violin concerti by Dmitri Shostakovich.

Igor Oistrakh (Игорь Ойстрах) (born April 27, 1931) is a Ukrainian violinist.
He was born in Odessa, Ukraine and is the son of violinist David Oistrakh. He attended the Central Music School in Moscow and made his concert debut in 1948. From 1949 to 1955 he studied at the Moscow Conservatory, winning first prizes and international competitions in Eastern Europe. He then joined the faculty of the Conservatory in 1958, becoming a lecturer in 1965. Since 1996 Igor Oistrakh has held the post of Professor of the Royal Conservatory in Brussels.
He has appeared frequently internationally, both as a soloist and in joint recitals with his father, or with his father conducting.
He is noted for his lean, modernist interpretations.

Yuri Abramovich Bashmet (Russian: Юрий Абрамович Башмет, Ukrainian: Юрій Башмет; born 24 January, 1953) is a leading Russian conductor and violist. n 1971, he graduated from the Lviv secondary special music school. From 1971 till 1976, he studied at the Moscow Conservatoire. His first viola teacher was Professor Vadim Borisovsky; after whose death in 1972 was succeeded by Professor Feodor Druzhinin. Feodor Druzhinin was also the tutor of Yury Bashmet for the probation period and for his postgraduate study at the Moscow Conservatoire (1976-1978). In the late 1970s – early 1980s, Bashmet developed his career as a solo performer. He began his active concert activities in 1976, with a tour of Germany with the Moscow Chamber Orchestra founded by R. Barshay. He has performed in leading concert halls the world over: in Europe, USA, Canada, Latin America, Australia, New Zealand and Japan. He was the first violist to perform a solo recital in such halls as New York's Carnegie Hall, the Amsterdam Concertgebouw, the Barbican in London, the Berlin Philharmonic, La Scala of Milan, the Great Hall of the Moscow Conservatoire, and the Great Hall of the Leningrad Philharmonic.
Yuri Bashmet has performed under many noted conductors, including Rafael Kubelík, Mstislav Rostropovich, Seiji Ozawa, Valery Gergiev, Gennady Rozhdestvensky, Colin Davis, John Eliot Gardiner, Yehudi Menuhin, Charles Édouard Dutoit, Neville Marriner, Paul Sacher, Michael Tilson Thomas, Kurt Masur, Bernard Haitink, Kent Nagano, Simon Rattle, Yuri Temirkanov, and Nikolaus Harnoncourt.