You can use whatever method you want. No one can tell you what works best for you. But reversals work very well for me and are always quite fitting with the reading. They tell me that there are blockages or negative extractions from the cards that need to be taken into consideration.
Some people say that they don't use reversals because they can't read upside down, which makes me laugh. Just take note that the card was reversed and then flip it upright -- from there, take into consideration that there might be some blockages or extremes of the card (i.e. Six of Cups Rx -- being trapped in the past as opposed to just looking back admiringly).
Whether you use reversals or not, I think a reader should be mindful that every card has a wide range of meanings to it -- negative, positive, blocked, repressed, extremes etc. So the reader must find a way, if not reversals, to compensate for not using inversions (elemental dignities, intuition, etc.)
There was a thread on here with a reader who didn't use reversals who got the Six of Wands, Page of Cups, and Ace of Wands when asked if she should "spill her guts" about how she felt about a good friend of hers.
She took those cards to mean a green light (they are rather lovely cards), but she ended up being heartbroken with the guy running away. Had she taken into consideration that those cards were ill-dignified or at least could have blockages, she would have read them as "I will end up feeling rejected (Six of Wands Rx + Page of Cups Rx) and nothing will spark from this friendship (Ace of Wands Rx)" Not "Go for it! You'll feel on top of the world (Six of Wands), he will accept your proposal (Page of Cups)and be flattered, and there will be passion sparked (Ace of Wands)"
So you shouldn't have to use anything. Use what works for you, but again, I would suggest using a method that takes the blockages of said card into consideration, too.