I both hate and love this question.
I’m absolutely a deck collector. I have dozens and I’m always looking for a new deck to fill a new niche but I don’t think there’s really a “best” choice since readings are subjective and some decks have a more niche case.
So what I can do is show my top used decks. Not neccesairly my favorites but probably the most useful for anyone looking to pick up a new deck (or even their first one 
).
Tarot of the Divine
Deeply connected with deities and folklore, I love everything about this deck and it’s probably my main go-to. If I travel, this is the one deck I bring (you can maybe tell how worn it is). Has a brilliant guidebook as well so I’d say very beginner friendly.
Universal Waite
This is an obvious one. It’s the classic and everyone should have it. Probably where most of us started as a first deck (and the obsession grows from there)! Also the one most people are familiar with.
If you’re giving someone else a reading, they’ll recognize these symbols. Sometimes if you pull an oracle deck they’ll get a bit confused.
Thoth
This should be another obvious one. Everyone needs it and it’s usually the second choice after RWT.
Elemental Power
This is often the deck I get to give as a gift (either to beginners or seasoned Tarot vetarans). We all inately feel the power with elements and this deck lets us connect to that.
