Hi Pravin,
Option 1: In this case ADBC might even worsen the performance due to the overhead in the ADBC framework. OpenSQL is the method to go here, as OpenSQL - from the ABAP point of view - features the optimal communication with the database while ADBC has overhead like constructor-calls for the statement, parameter binding, etc.
Option 2: In this case ADBC is comparable with EXEC SQL but features more options, e.g. clean concept of multiple connection (connection objects via CL_SQL_CONNECTION), exception handling, etc. So I strongly propose to favour ADBC over EXEC SQL, but not simply for performance reasons. You might have a look at the ABAP Language Help in your system on more information on ADBC and the advantages over Exec SQL.
Cheers,
Jasmin