I think the issue is likely to depend upon whether it is a ground level track or raised.
If raised there are fewer 7.25" raised tracks to visit should you wish to do so, and if ground level the fly in the ointment would be the tender on a large loco – I can assure you that it is a long stretch, and hard on the back to stretch over a 5" tender on ground level – it can be a problem on a raised track, but on the ground – ouch!
As to performance that can be the same, less or greater depending on the individual locos so I cannot help there.