I’m on a Kickr Core now, +/- 2% accuracy.
I was using an old cyclops fluid 2 wheel on trainer with Wahoo blueSC sensors. I think once you get over 200 watts on that trainer it got very inaccurate very fast.
it can be an increase or decrease. although in most cases it is a decrease.
ask yourself - what speed can i maintain outdoors? is it anywhere close to the speed i can do on zwift?
I’ve seen riders go from Cat A → Cat D upon upgrading trainer on ZwiftPower forums in the past 
the big benefit is that you get to experience all the hills etc. on Zwift courses with a smart trainer vs riding at the same power/cadence the entire time on a dumb trainer. this will help better prepare you for riding outdoors. if you train at the exact same power/cadence all the time, you’ll get really good at riding at that pace, but when you go outdoors and you are forced to ride in different gears, you will struggle also workouts with ERG mode on are really quite awesome (where trainer adjusts resistance automatically for you), which you cannot do with a dumb trainer (and it can even be impossible to hit the target cadence/power the workout is asking for if ur gearing does not allow it).
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Cheers Ben.
I never ride outside, ever. Only got involved as gyms shutt and my achilles started playing up stopping me running. I have biked indoors a fair bit during running injuries - mainly wattbike.
Fairly decent background running 14.01(5k) and 3.42(1500m) so I guess that helps with the stamina etc…most likely sub 15 5k shape atm…I suppose I should mix it up at bit rather than just smashing it everyday.
ok with a 5k time like that you are prolly capable of at least Cat B pace on Zwift 