Are there any feelings on which they prefer and/or if applicants are more successful using one or the other?
Does the Clemson application show specific interest in Clemson?
Does it help to visit Clemson more than once?
S20 really wants to go to Clemson - anything we can do ahead of time to increase his odds of acceptance?
Clemson says they do not have a preference on application. The best way to increase chances are to maximize test scores and GPA. All the best!
Agree with @Baxter126 . Look at the Common Data Set for 2017-2018. You will have the option to also see 2018-2019 which comes out in the next couple of months I think. Common data set lists very important factors as rigor, rank, gpa, test scores, and state residency. Seems to be holding true with 2019 admits so far. @sunnyschool do you mind sharing his stats? Also, get app in early (opens 8/1 I think) because housing priority is determined based on when you submit the application.