Is layer 1 or Layer 2 better?

Could you please elaborate on the relative merits of Layer 1 and Layer 2 in the context of cryptocurrencies and blockchain technology? I'm particularly interested in understanding the differences in scalability, transaction speed, and cost-efficiency between these two layers. Additionally, could you discuss any potential security considerations or limitations associated with each layer? How do they compare in terms of supporting decentralized applications and fostering innovation within the crypto ecosystem? Finally, given the rapid evolution of this field, do you foresee any significant changes in the balance of power between Layer 1 and Layer 2 in the future?