Quick publication in a good journal VS long fight to publish in a very prestigious journal. What's more impactful at the beginning of a career?
Given that you aren't yet in a doctoral program and so have some time left in your student career, a long review process doesn't seem like a huge issue. Normally I'd give the old advice &quot;Don't let the perfect be the enemy of the good.&quot;
Even being under a long review by a top journal is a plus and you can point to it for most purposes.
No one can predict however and you take some chances either way. Nobody guarantees quick review or eventual success. Nobody serious or honest, anyway.
If your advisor thinks it is a top quality article, then that is probably good advice.