You are opening Pandora’s box as there are so many threads, and as many opinions. To save you the pain, in summary, you will find champions for both solutions and the only way to solve it is to hear for yourself. I went from one to two, and felt that it added a little of what I liked. Others say that the 282 becomes a bit bloated, so that is the dilemma that only an audition will solve. Be prepared, because very quickly people will mention a Supercap and muddy the waters further.
As others have said, there has been a fairly recent post on this question if you do a quick search. I’ve gone from single, to double to SC (all DR versions) & each was a step up (more info in other post). Will say, if your current HC is non DR the best first step may be to have it serviced & upgraded to DR (or just sell/trade up to a DR version)