I am lost between the 1z0-147 and 1z0-052,First of all, I'd recommend 1Z0-144 over 1Z0-147. Here's why:
Which one would be better to boost my career?1Z0-144 would be better to boost your career as an Oracle developer. 1Z0-052 would be better to boost your career as an Oracle DBA. Which of the two is better depends on you, not on any merits of the two career paths. You might be a good DBA but a horrible developer... or the reverse (or good at both or terrible at both). I don't know you so can't even begin to guess.
which one is easier to start with ?Not the right question. You don't pick a certification because it is easy. You select an IT certification that is most likely to boost your career. In any event, that takes us back to the above... whether you find the exams easy or hard depends on you -- not on the exam. If someone tells you that exam A was easier than exam B, they are only talking about how easy it was for them. Even then, a huge portion of how easy people find these exams is how well they prepare. Do enough preparation before the exam and any of them are easy. These are multiple choice tests. If you have read and understood the material, the answer is always sitting right in front of you on test day.
Would it be safe to say I can go for the 1z0-052 even though I don't have lot of experience in PL/sql programming ?Not really sure what you mean to be asking. 1Z0-052 is the DBA certification, 1Z0-144 is the PL/SQL certification: