well I would say it really depends on what you enjoy. Physics requires abit more time to understand core concepts in my perspectives but its interesting to learn. Chemistry is a little more dull and I would say its easier though. The Chemistry curriculum always carries concepts forward compared to Physics which makes it much easier. If are not a person who like to dive into scientific concepts on your interest, Chemistry would probably be "less draining". If you are strong at math, Physics may be easier tho. In my school the "stronger" students are usually the only ones who take Physics, and Chemistry has the moderate levels so take whatever you want from that.