Hello Romain,
This ODBC generic adapter is not mentioned in EIM documentation because it's a native Hana connection, however going by Oracle Generic ODBC will force you install Oracle driver on your Hana server, the log reader will allow you to not doing this, you need to load the oracle jdbc driver on the DP agent server instead.
Yes you can use OracleLogReader to replicate table in Hana, it is base upon replication on source table change captured.
When you use generic adapter you will need to create the virtual table you want to work with manually, going by SDI adapter will generate if for you over the workbench and generate procedure as well from the workbench where you can also make all the transformation you need on specific table that you want to replicate in Hana.
Using SDI can be very useful in many scenario, i have created documentation on it that you can check on my content.
Williams