The 3 pedal Opticruise in Scanias is a much maligned box but for a driver coming from manual to their first auto is, i believe, a good choice, the 420 4 series Scania attached to it is a good wagon too and a lot more economical than a 380/420 Volvo of the mid noughties.
The clutch is only used for stopping and starting off, and obviously for maneuvering which is the advantage this box has over all other 2 pedal automated manual boxes.
Its also a superbly accurate box for driving in manual mode, there are two modes to the shift in both auto and manual, there’s A and AH(P), the H mode is meant for hill climbing because it allows gears to hold on higher up the rev range, its also a faster change than normal A.
If you want to try manual driving, again you’ve got M or MH(P), in MH the changes happen faster, the box responds accurately and instantaneously to your input, flick the lever twice it’ll block shift 2 gears instantly, especially useful, vital even, for steep hil climbing, in auto steep hills can result in the vehicle losing speed so quickly the gearbox can’t keep up in auto mode, in manual once you learn the ratios you can block down up to 3 gears at a time in M or MH so you can keep momentum in the right gear every time.
MH also gives faster more controlled acceleration away from rest, obviously its the best for exhaust braking too because you can keep the revs in the correct band for max retarding.
Only ever known one failure on an Opticruise 3 pedal and that was some electronic unit atop the box overheated one very hot summer’s day, fortunately i was on holiday at the time, other than that the box never gave any issues.
Volvos auto box is good in auto, not as easy to drive in manual mode in my humble but not really needed, can’t say as i’ve found them particularly reliable long term when compared to Scania and ZF Arsetronic autos, thought to be fair my experience is all with vehicles fitted with one or more PTOs which may have some effect on longevity.
Much as i prefer manuals i would never suggest a manual Volvo or Scania over either of their own autos, the Swedes affectation for full synchro boxes ruins them, if you wanted another manual i’d suggest finding a good CF or XF Daf 460 with the 16 speed box, a lovely box to use.
Arsetronic is reliable, but not exactly inspiring in use, improved again if you drive it in manual…but note arsetronics tend to have clutch release bearing failures anytime from 500k upwards depending on how much real work the vehicle has done, if left the bearing will fail and its a tow in job.