People without a dyno say road tune is better to justify their service they offer which could be a big source of income.
Fact is with a "road" tune you have no way to effectively measure changes in tractive effort through cam angle and ignition changes. All you can effectively do is tune AFR which is really a small % of what actual tuning is all about.
Yes it will be safe if "stock" ignition values are used but often will be a long way off what is optimum.
Don't get me wrong its a good thing to offer especially for people that don't have access to experienced dyno facilities or want to have a go themselves and just have someone to help and advise but its far from what you can get out of the car.
The way to work which I do with ALL cars whatever make and model is to tune on the dyno to achieve optimum fuel, cam and ignition settings, THEN take the car on the road to ensure good throttle response and transition from high to low cam. The cars returned to the customer for them to drive it and give feedback without me even being in it and if they pick up on anything I can make changes while they are there.
With everyone satisfied, they then pay me and drive off with a big smile.
My 2p from someone that has a dyno AND does "e-tunes" but to get customers to a safe point so they can get to us for full tuning.