Sehwag or Lillee.
Some stats to help.
Runs
Batting records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
Wickets
Bowling records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
150+ scores
Batting records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
5+ wickets in an innings
Bowling records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
200+ scores
Batting records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
10+ wickets in a match
Bowling records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
250+scores in a match
Batting records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
Some stats to help.
Runs
Batting records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
Wickets
Bowling records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
150+ scores
Batting records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
5+ wickets in an innings
Bowling records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
200+ scores
Batting records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
10+ wickets in a match
Bowling records | Test matches | Cricinfo Statsguru | ESPN Cricinfo
250+scores in a match
Batting records | Test matches | Cricinfo Statsguru | ESPN Cricinfo