Is it worth taking my Range Rover to a specialist workshop instead of the agency

My Range Rover Evoque is about six years old now, and lately the gearbox has started to feel a bit rough when I shift from second to third, especially in the morning when the engine is cold. Is that something that can wait a few weeks, or could it get expensive if I ignore it? I am not a car person, so I honestly do not know if this is a small thing like fluid or something serious inside the transmission. The agency gave me a quote that felt too high for a car this age, and the service advisor kept using words I did not fully understand, so I walked out without agreeing to anything. Since then I have been asking around for independent options. A neighbour who owns a Discovery told me specialists often know these cars better than general garages, because they see the same faults again and again, but he also warned me that some places only pretend to be specialists. I found range-rover-repair.ae while reading about common problems, which gave me a basic idea of what could be wrong, but it did not tell me where to actually go or who to trust. So I wanted to ask here. Has anyone used a place for Range Rover Repair Musaffah Shabiya and felt the work was honest and fairly priced? How do you know if a workshop has the right diagnostic tools for these cars and not just a basic scanner that reads a few codes? Do they explain the problem clearly and show you the old parts, or do you just get a bill at the end and have to believe them? Is it better to ask for original parts, or are good aftermarket ones fine for a car this age? I read that some people regret cheap parts on these cars, but others say the price difference is huge and the quality is similar. And does a repair done outside the agency affect any warranty or resale value later? My car is out of warranty, but I might sell it in two years, so I do not want to create a problem for the next buyer. Another thing I keep wondering is how long these jobs usually take, because I need the car for work and cannot leave it for a week. Do they give you a rough time estimate first, and do they keep it? Also, do they offer a written warranty on the repair, or is it only a verbal promise that disappears when something goes wrong? I have heard stories of people returning after two weeks with the same fault and being told it is a new problem. I am not looking for the cheapest garage in town. I just want someone who tells me the truth, does the job properly, and does not push extra work I do not need. If you have a name you trust, a rough price you paid for a similar repair, or a mistake you made that I can avoid, please share it. Even a short reply would help me a lot. Thanks a lot, I will read every reply tonight.