dyno tune vs street tune

[draper]

Talked to a local tuner who does street tuning, he does tracking and he recommends tuning a car on street as it is exposed to real variables than on a dyno and he got all the software and equipment to log

From what I read on other forums and most of them are F.I cars

1)A/F ratios can be fine tuned and easy to monitor this
2) Ignition timing results will be harder to monitor.
3) Street tuning is not safe unless done on a private road.

Tuner wants about $450, I guess it'll take few hours to tune from a factory map but I've a custom tuned map that was done on a dyno, would I not be better off starting on this tuned map as a base?

what do you guys think?