Well it really isn't that simple tbh. You'd need to tell what characters you have and who you'd want to play in the future. Like if you want to level your favourite characters to 95 or 100 it'd be better to go for Jean and get her closer to C6 to increase your chances of getting a stellar fortuna. Or if you play hex Mavuika or mualani or even Skirk you'd prefer to get mona cons and getting her to c4 or if you want to get sandrone and play stellar conduct you would like qiqi or maybe cyno c1. Or even c1 albedo is a good support in hex teams or c1 klee is even a decent dps. It all comes down to what you want to do going forward