Is it better to submit test scores?

It depends on whether or not your SAT score is above or average for the school you're applying to. If it is below, I'd recommend not submitting it but if it is average or above-average it wouldn't hurt.

So at test optional schools it is like optional recommendation letters it doesn't hurt but if submitted it can boost chances assuming you don't get a 800 SAT when the average is 1300 but if it is in middle 50% (just google mid 50 sat blah university) and if it is in the middle or higher definitely submit it.

i agree with all the other responses. this is my recommendation - take the test, and if you do well enough (say middle 50% or average) then you should consider submitting the score. it will look bad to submit a score that is below average for any university, so if you feel that your score isn’t a good representation of your academic capabilities then don’t send it in. that being said test optional colleges still take sat act into consideration the kids who take and submit scores have a slightly higher chance of being admitted simply since the admissions officers can get a more realistic image of what they are like academically

Like the other people have stated, if your score is around the average score of that school or above, it would definitely help you. However, if it is below the average SAT/ACT score for that school, it is better to not submit it!