If the individual Roo is notoriously aggressive, I'd avoid. If its merely that someone(s) have told you that breed X Roos tend to be aggressive, then if you can, buy young and socialize it well.
Otherwise
@Ridgerunner 's advice is sound and thorough. and by choosing a RIR for your stud, you will find no shortage of information available on expected crossings with various breeds, etc.
As you hunt about on google, you will find a lot of trade names for various sex link birds, mostly for purpose of egg laying, but the cockerels are plenty tasty for meat, they just aren't CornishX (for good or ill, dependent upon your needs and expectations). Sadly, the trade names don't tell you the exact mix, but it should still give you a good idea in a general sort of way. i.e. at least two big hatcheries sell "Golden Comets", a red sex link bird. I have some myself, from one of them. In the case of one hatchery, its a "Cherry Egger" (their RIRs) over a Rhode Island White, in the case of the other, its a RIR over a White Leghorn. In either case, you get a roughly 4# hen +/- who produces a prodigious amount of good sized brown eggs (lg+ typically) beginning at a very early age (18 weeks +/- on average, seasonally dependent).
tl;dr - its a well respected rooster for producing some commercially important crosses - hard to go wrong with that as the foundation for your flock raising.