Blue Owl or French Cartomancy are clear and easy to read. Lenormand works like a pictogram language so the many layers and symbols of tarot cards have no place in Lenormand decks. You need to be able to see at first sight whether it's a bouqet or heart, ring or cross, house or garden, without guesswork.
I'd choose a deck with playing card inserts, I find they add depth especially where court cards appear.
You can even buy blanco cards from a crafts shop and simply write number, name, suit and colour on each card, and over time, add keywords. That's a good exercise and gives you a learning deck.
If you study from a book that you like, use the deck recommended in the book or used there. I learned from a book illustrated with Blue Owl cards and I still like them.