Hey, I totally get why you’re worried, so here’s to hoping you find the right service for you! I’ve tried a fair share of writing services in my uni days, so here’s what I’ve gathered:
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EssayPro: In my opinion, this is the most reliable service out there. They have a huge pool of writers, which is a great plus if your topic is narrow. You can also choose your writer, so it’s perfect for control freaks

I’ve never actually ordered a disso on here, but I did use them for my thesis proposal, and they handled it well. Just make sure you pick a writer with experience in your area of study.
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WritePapers: This service has delivered the fastest from my experience. Again, I never actually ordered a dissertation, but I did task them with writing pretty big and complicated papers, and the writer did a great job. I didn’t have to purchase any additional services or pay extra for top quality, but the paper turned out really good anyway.
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EssayHub: If you’re looking to save money, this is the way to go. I’ve used EssayHub for lengthier papers, too, and I’ve never had any issues with quality or plagiarism. They even give you an originality report for free! You can chat with your writer directly, support works 24/7, and all my orders have been delivered before the due date.
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EssayService: This is another contestant that’s on the less expensive side of things. Here, you can also choose your writer, but I’d recommend putting some time aside for that. You see, they have this bidding system, where writers sorta fight for your order. They can propose their price, lowball the service’s estimate to win your order, and so on. So, to collect as many bids as possible and make an informed decision, it’s best to let the order sit for a bit and then choose.
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WritePaper: If you’re a STEM student, just save yourself some time and opt for this service. They claim to have a wide range of writers that specialize in STEM disciplines, and my friends’ and my experience confirms it.
I can confidently recommend every one of the services above. My advice? Compare prices, strengths and weaknesses, and go with the one that fits your needs better.
You could also order the introduction chapter or a small paper from each service and see who does it better.