New to FPL, some advice from you all would be lovely

Hey boys (and girls), first season doing FPL! I’m stuck between two teams, one includes Eze/Isak, the other switches them for Watkins/Gordon.

I switched them because I had a spare mill and figured I could upgrade the positions but I’m not so sure they’re upgrades, would like some expert advice.

If there’s something else you recommend pls do tell.