I haven’t used copics much if I’m being honest because they’re so expensive. After doing some research, I wound up getting some Ohuhu (brand) markers. I bought them through Amazon and they work well enough for the limited artwork I use them for, but I can’t vouch fully for their quality as I haven’t worked with copics much. I think copics are easier to blend from what I recall. Also, since they are an alcohol based marker you can’t return them because it’s considered hazardous through Amazon I think (I was gifted a set from someone after I bought it and tried to return one lol). In the end if there’s an issue Amazon might just tell you to keep it if they’re defective. Just something to keep in mind if you do order through them. I also know Wish has some dupes but those seem more dubious quality and I didn’t try them.
I’m also not sure, but I think you at least used to be able to get refills for copics. I know a friend of mine got a refill for some of her darker colors that she used to blend a lot but that was a few years ago. Apologies is this is too much information lol.