That's not so easy. Long filters are accurate in frequency domain but have poorer performance in time domain. And short filters the opposite.
Long filter response is affected by transients which occurred longer time before and after an event and thus introduce a transient smear.
These posts explain difference between long and short filters and also disadvantage of very long filters - at least theoretically:
https://audiophilestyle.com/forums/topic/19715-hq-player/page/1082/
"When the filter gets longer (more taps) in time domain, it gets steeper in frequency domain and vice versa. This is because frequency and time have
1/x relationship. Longer the filter, longer it "rings" or "smears" in time domain. While if it gets too short, it begins to roll-off early which in turn means it reduces the high frequency components needed to make quick time domain details, so it "slows down" the transients. Too short filter can also begin to "leak" that means the reconstruction accuracy is lost as result, and as result produces imaging distortion.
Making a filter that is perfect in both domains simultaneously is mathematical impossibility. Only unlimited bandwidth, like you practically get with high rate DSD recording (minimum DSD128, but optimally DSD256+), can give you both at the same time. Band limited PCM has the problem though."
https://audiophilestyle.com/forums/...rdinary-person/?do=findComment&comment=175928
"Longer/steeper filters change faster from passing frequencies to not passing frequencies as function of frequency. Shorter/gentler filters transition more slowly or "gently" from pass to stop as function of frequency. More accurately the filter wants to detect frequencies and transition pass/stop faster, longer time the filter has to "look" at the signal. This has side effect called "ringing" or rather "time blur". On the other hand, extremely short filter like a one that looks only at single moment cannot filter anything at all, because it sees only single point of time at once without any history or future (so it cannot detect any frequencies as those are a change over time)."
About "irrespective on genre" - that's also not so easy,
"Thus the rough starting point recommendations go along the lines of:
- Long linear phase filters for classical in acoustic spaces
- Short minimum phase filters for multitracked studio rock
- Relatively short linear phase filters for jazz clubs"
read the whole post about it:
https://audiophilestyle.com/forums/topic/19715-hq-player/page/1086/