Search the previous posts by paladin, aka me, on tailoring in Vietnam,
Generally I have tailored with Jesse and sons, tailorworx, binh tailor, Paul bespoke and visited nhut tailor and vanda tailors and even wrote a guide on them.
Depends on whether you place emphasis on quality or budget. From what I read, you can be penny wise, but pound foolish.
For shirt tailoring, the quality of Jesse and sons is superior to all vietnamese tailors mentioned in your post except for those who charge higher, e.g Sir Tailor, Cao Minh, etc. reason being jesse includes MOP buttons, different collar fabrics and a lot of customisation for free. The vietnamese tailors you mention do not offer MOP buttons, and nope, their sewing machines are not top notch nor do they do complicated features like misaligned armsyce or gussets too. The shirt collars not super hard or have collar stays too. If you want a basic shirt that fits, yes, vietnamese tailors can do.
Paul bespoke is in Danang, not Hoi An.
Paul bespoke cutter is the disciple of Nhut master cutter and affiliated.
Cheap price is normally because they use Vietnam produced fabrics from local mills which are far in quality from Chinese mills and are miles apart from European mills like Thomas mason, albini, Alumo.
You can use European fabrics at vietnamese tailors, e.g Binh tailor sells soktas fabrics, but the price is as high as Singapore, if not higher due to tariffs.
If you die die must go Hoi An, the only notable tailor who sells European fabrics is Vanda,as they purchase fabrics from local Singapore wholesaler, so Singapore has no tariffs and Singapore to Vietnam has free trade agreement and no tarriffs.
Quality of tailoring in HCM is better than hoi an due to higher income and so, ability to pay higher price. You go Hoi an if you are low on budget and time and you can collect your shirt on the actual day of visit as workshop is in the same building or within old town. Within old town,there are easily more than 30 tailorshops, so it's very competitive for tourists dollars but the fast turnaround for tourists means the quality suffers. Hoi an is good for newbie on very low budget or tailoring for their children. I tailored a suit for my son there for sgd90 for workmanship using my own Dormeuil fabric.
I have WhatsApp numbers of all of them here and not impressed with their shirt making, but I think Jesse offers value for shirt making.
Best shirt makers are Chinese as they had invested lots into hardware like sewing machines that can stitch 25-28 stitch per 3cm. Jesse is at 18 stitch per 3 cm and the rest are probably 15-16 stitch per 3 cm. Gussets, split yoke, misaligned armsyce, single collar, collar stays, claw stitched button, oblique buttonhole.  Neapolitan style, top MOP buttons, you name it, Chinese tailors can do it.
If you are willing to measure your best fitting shirt and do MTM, I sell branded fabrics, e.g Alumo, Thomas mason, Albini, MTM shirts for $140-150 each for 3 or more shirts. You can pm me if you want to save on travelling costs.
Tailoring is a relationship business. You think you squeeze value out of cheap tailors, actually they may be squeezing out of you. A higher priced tailor can often offer better value for money than a cheap tailor who produces clothes that you 看不上。