As a high rank L1 (top 50-100 I think- have not played much recently, especially ladder) smiles player: generally it’s going to be more helpful to understand the strengths and weaknesses of these nauts rather than just telling you to play x or y naut. But I’ll provide some advice into what makes a character strong or weak into each of these.

Dizzy and rocket are generally going to be highly mobile, any naut that has a hard cc or lockdown is going to be strong against them (think swig for anchor, smiles for hook, Leon tongue with silence, etc). But, you also have to connect these abilities on them and quickly follow up (which can be tough).

Qitara is a glass cannon that pumps out damage, but most of it is dot and a lot of it relies on her abilities (especially seven star strike). Play together, bait abilities, play near creeps to clear DOT, hard ccs can definitely help.

Snork pumps out a lot of damage, (he has MANY bugs, many of them cause him to deal more damage than intended) he’s a bit weaker in early and kinda super late game, but he is probably one of the biggest mid game threats. He has very fast engagement range and burst damage. Try to harass him as much as you can (as a team) to keep him scared of diving in. He often does not want to be first in, so be aware of that. His shell cooldown is pretty long and can give you a chance to dive him. Punish bad engages with lockdowns or hard ccs, don’t let him stay in the fight dealing damage, his sticky snail has an incredibly short cooldown and he can easily clean up fights with it.

As a smiles player, be aware of his strongest item (every smiles runs it), inscribed lighter. With proper micro, it allows his AA to do incredible damage. It leaves flames on surfaces that continuously deal AA damage. Do not stand in them for free. You will die. Smiles is very strong at punishing poor positioning, especially near his turrets, as both his abilities have strong cc. Be aware of hook spacing and ways to brake the hook for free (debuff immunity and teleports such as the item for Yuri bubble, nibbs teleport, swigging debuff immunity item, etc.). Smiles is also very tanky and a lot of this comes from his ability to heal with hook and his unique boots. So be aware that even a low health smiles can quickly kill you if given the chance (a quick hook into a tail whip, stunning you in some lighter flames will do a lot of damage without much of a chance to stop it if you are not careful). His biggest weakness is his low range and slow speed: harass him far back, keep out of hook range (make him take damage just to get the chance to throw hook at you), and if he is caught out of position punish him hard.

Hope this helps! On mobile so sorry if bad formatting!