Truffles: how do I pick between buying truffle or truffle oil?
If you want "the most (real) truffle aroma", as you write, there is no question that it will come from real truffles.  With a bit of Internet searching you can see that truffle oil is generally a chemically derived product.  While we can debate whether or not any flavor or aroma that is created in the "lab" is the same as the real thing, you specifically want to experience "real" truffle.  The only way to do that is with the authentic item.  The challenge is that truffle aroma/flavor is fleeting.  So, the closer to unearthing and the closer to the source the better.  To me, truffle is a unique and special item.  So, when you want to experience it, get the best and most real truffle you can afford.  Have fun using it in dishes that highlight its aroma and flavor, then wait for the next special occasion.