I'm no expert on this but I would say a ramp is probably better as long as it's suitable i.e not too slippery etc
Having said this, Alfie had a ramp, never used it, therefore never usedthe 'upstairs' so we took the ramp out so she had more room on thelower floor. Being the contrary creature she is, she started using the'upstairs' immediately - she just hopped up. She looks a bit ungainlybellyflopping down again but when we offer the original ramp or anyvarients, she just flat ignores it. Silly bunny
So it might be best to try the ramp then take it out if it isn't asuccess - after all, if it's the same price you wouldn't be losing