Hi Rubis,
Being from a technical background, I can only say Oracle and SAP are like CRM systems. Basically, an SAP HR or an Oracle HR course would help you work on the HR software that many big organizations use, but not all. Many big brands that have a considerable number of employees still use traditional Excel and Access (as a database) to come to conclusions.
Another thing, as I mentioned before, SAP and Oracle are just CRM or database/information handling mechanisms. They won't give you core HR knowledge; they would teach you how to do tasks, such as recruitment, easily by maintaining data that gets updated automatically. However, they won't teach you the core process of recruitment. I hope you can understand the difference.
Regarding which course is better, honestly, I've never inquired. The reason being, in order to understand a shortcut or an easy way, we must first know the long cut or a difficult way. I am trying my hands on Excel and managing my data on it (also because we have fewer than 50 staff). So, I can't tell you which one is better.
But I would recommend first understanding the core HR process and practice, and how it works, and then only if required, you can learn the shortcuts of the process. It may happen that the investment you'd make for such a course may not be put to use unless you are with a brand or big organization with a large number of employees. It might not be of help. One of my friends is working at a brand in the IT industry, headquartered in Mumbai but with offices at many places and an employee strength of 1000+ or even higher, and yet she uses Excel to make trackers.
Just to give you an idea of how fruitful or futile it would be to undergo SAP/Oracle at the beginning of your career. You can always do so later when you think it becomes essential.
(Again, that was my suggestion. You're free to seek advice from other professionals here who have better experience.)
Wish you luck.