Yes popcorn is healthier for you than chips.
Popcorn contains less calories and also no artificial ingredients like the chips contain and if you make the popcorn homemade then you can choose how much salt and other ingredients to add to your popcorn so the popcorn is healthier than chips.
With chips there are lots of other non natural ingredients that make the chips more non healthy for you than popcorn.
The best and healthiest popcorn you can eat is popcorn that you pop in your own popcorn popper and not already popped popcorn that may contain too much salt.
Salt is healthy for you in moderation as well as some butter but too much salt and too much butter can be a health issue when eaten too much.
But if you're looking for a healthy snack then eating popcorn that you make at home is the healthiest option instead of eating chips.
Even eating chips sometime is okay but just don't eat too much chips.