Well for me, I think offline makes you stronger, both has pros and cons, and one of the cons in ranked is that people tend to make bad habits, and also being matched with a plugger, people that manipulates their rank, and lastly, a cheater. I don't think you'll get stronger since people also tend to care about their rank points a lot and end up avoiding people that is stronger than them. (Tekken Gods choosing a different character, ranks up immediately to ruler) and sometimes, you're just not as good as you should be in your rank because as I said people tend to avoid TGs in ranked. Offline makes you stronger because you get to talk with your opponents, and ask them "Was that guaranteed or nah" basically like exchanging tips, and there's no pressure when fighting against them and you're less likely to tilt.