Different decks click with different people based on where they’re from. My European friends usually prefer the Marseille deck; something about those simple geometric designs just works for them.
Meanwhile, people who like story-based readings tend to go for RWS. I sometimes read with chamomile tea when using traditional decks, which helps me focus. Since you’re looking at different traditions, you could try working with both. I use Marseille in the mornings and find it good for getting those gut feelings. Then RWS later in the day, when I want to think through what came up earlier.
Each deck has its own vibe from where it was created, but they’re all getting at similar ideas. Just pick whichever one feels right to you.
Also, don’t just write off modern decks because you think it might be easier or give you some kind of deeper meaning that you need. Some very successful readers will work with only Oracle decks, and there are some great Oracle decks for beginners. Don’t restrict yourself if it doesn’t suit what you really want.