honestly, I try to keep a mix of both. I keep my emergency fund in a regular savings account just for easy access, but Ive been leaning more toward a high-yield savings account lately because the interest makes a big difference over time.
for money I dont need in the short term, Id rather put it into investments so it can grow faster. I think it really depends on your goals and how comfortable you are with risk. Having some cash saved for security and letting the rest work for you seems like the best balance to me.