
Flexispot
E7 Pro
Affordable and stable, but assembly can be confusing.

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https://preview.redd.it/1wcowf5v35kg1.jpeg?width=3000&format=pjpg&auto=webp&s=29d4897c5d82f6a2e37263a44b32149469b638b8 I really enjoy my Uplift desk with their triple monitor arm
You could get the uplift desk L-shaped frame without the top for $719. This will allow you to put almost any size top on it. It can be cheaper to make your own top or get one made. Cheaper frames might wobble too much when walking on a treadmill and will get annoying. The frame is the important part of a standing desk. Assembly is pretty easy although the parts are heavy.
I would say that the top is worth the cost, but you might be able to get one made to your liking for cheaper. Or get the legs first then upgrade the top later.
I have the uplift v2 3 leg L shaped desk and can sit (220 lbs) on it, and it seams like the motors do not notice the extra weight. So any uplift 4 leg would work really nice and quiet. I got uplift because a lot of other desks had loud motors
You could go the way I went by getting an Uplift frame for $550 to $799, and then get a top made locally. For the three monitors Uplift has a three display arm. I have a 34in ultrawide and 2 24 in monitors on a single arm. I had posted my setup here https://www.reddit.com/r/StandingDesk/s/XBQlRhOVeg
I run a tripple monitor setup on an Uplift v2 desk with a treadmill and it barely wobbles, it is only noticeable if you are really pushing on the desk at full height. I would recommend getting an L-shaped desk as it will wobble less. The v3 desk is supposed to have less wobble. https://preview.redd.it/41ejjkg8hcug1.jpeg?width=3000&format=pjpg&auto=webp&s=0b517389f4322a1b41fdcebdaf099fb32e474257
I got an Uplift desk because I tried out some other brands and most desks when at a standing height wobbled too much or had noisy motors. I did not go with the fully custom top but went with a solid bamboo top for about $1800. One option you could consider is only buying the frame from Uplift and getting a local top made to your preferences. If you can get someone to make you a top for less than $1500, you would be saving money.
I just bought an uplift L shaped with black bamboo and I have zero regrets
Uplift is a legit brand. I have their L-shaped standing desk. I'd definitely recommend it.
I have been super happy with Uplift Desk
I have a 60” bamboo V1 L shaped desk that is about 8 years old. And I also have a 72” V3 L shaped desk that is 6 months old that I custom made my own desktop surface. Both are great. The v3 does wobble a bit less at height but both are pretty solid.
I’ve got an L shape Uplift desk frame with stained butcher block tops. I think it was $1200 for the frame and other Uplift accessories, and $200 for the butcher blocks $400 for that is a joke or a scam
Another vote for an Uplift - movement is steady and stable throughout (up and/or down). I opted for an L; it'll basically hold a verital party weight-wise (500lbs). I'm using a Gen 2 ARC and a 32" OLED (PG32UCDM on an arm), along with a work laptop and gaming laptop on stands on top with a full tower custom on a holder underneath and it's just as smooth today as when I put it together 2 years ago...

Flexispot
E7 Pro
Affordable and stable, but assembly can be confusing.

Uplift Desk
2-Leg V2 Standing Desk
Durable, stable, but expensive with poor cable management.

Dezctop
Bifrost Series
Modular design with great cable management, but pricey accessories.

Flexispot
E7 Plus Max
Very stable and durable, but assembly and cable management are tricky.

Secretlab
MAGNUS Pro
Excellent magnetic cable management, but expensive and gamer aesthetic.

Ranked #1
Uplift Desk - 2-Leg V2 Standing Desk
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Ranked #1
Flexispot - E7 Plus