I have both, if by classical guitar, you mean, nylon string guitar. I play anything on my nylon string, crossover. I use my finger nails and they are a little long. My wife hates them and is constantly telling me to cut them down.
I switch from my nylon string guitar to my banjo, to my tenor ukulele with very little adjustment. I also have a 12 string guitar with steel strings which is tuned down to baritone levels. I play all four instruments with my fingernails. All four are as loud I need them to be.
The lower tension on my 12 string (B,E,A,D,F#,B) doesn't wear my nails down and feels very close to my nylon equipped instruments. My banjo is also strung with nylon strings which I make up from harp strings. It is a long neck and regular sets of nylon banjo strings are too short.
I gig these instruments about 4 times a month using a mic rather than onboard pick-ups.
I have owned many true classical guitars over the years but the slightly narrow neck (1 7/8 nut)and 18" fret board radius on my Martin 000c make the switch to my 12 string easier than using a true classical with it's flat fret board and 2" nut width.
Kerry Char baritone uke, Kinnard baritone uke, Kelali baritone uke, Kamaka baritone uke
Burke baritone uke, Martin B51 baritone uke, Primrose baritone uke,
Pono Bn-3-4 tenor guitar, Pono Bn8-1 8string tenor guitar, Republic Hwy49 tenor resonator guitar
Hoyt/Ode custom model33-19t tenor banjo, Hoyt custom 10"maple baritone banjolele