Primacy 3 is not comming in 16 or 17. Primacy 3 is more a balanced kind of tyre.
Not to hard not too soft
Not too noisy not too quiet
Not too sporty not too comfy.
I have put 17" in my grande thats why i have moved to primacy 3. But i also have advan dbs with me. They are in store of my house.
Only michelin energy saver series are avail in 15 and 16 i guess. And that is not a premium tyre. So Advan db is best choice for 15" tyre.
It all depends on your budget plus what you want.
Comfy and noiseless ride : No tyre can pass Advan db in this case in 15"
For sportiness : there are lots of options.
When i went 17" i wanted more sportiness in my tyre. So i went for michelin primacy 3 made in germany ones. They are sportier and comfy at the same time and only avail in 17"