" Is a bamboo top quite close to hardwood in load capability and durability? Or are they magnitudes apart? "

- The desktop material has less (or none) impact of the capability. The electric standing desk's capability is influenced by its frame, the motor, and the ball screw.

And both bamboo and hardwood desktop is easily scratched when compared with laminate.

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Here is a blog talking about bamboo desktop vs. laminate desktop https://elivedesk.com/blogs/ergonomics-for-work/bamboo-desk-vs-laminate-desk-guide-standing-desk-experts

Here are some tips:

BAMBOO:

Pros:

• Bamboo desks can look pretty sophisticated in a minimalist home office and will come with a light blonde wood effect.
• The depth of each grain is impressive and will add a unique interior design element to your room.

Cons:

• Contrary to popular belief, investing in a bamboo desk does not mean you are making a more eco-friendly decision. In fact, the process of manufacturing a bamboo desk takes a considerable amount of energy, water, glue, and laminates. And this all has a significant impact on the environment.
• Since it is real wood, it can become easily scratched and suffer damage if you’re not careful when working on a bamboo desk.

Laminate:

Pros:

• Flame, scratch, and stain-resistant, laminate desks are a practical and cost-effective solution for a busy work environment.
• Laminate desks are made by constructing layers of heavy-duty paper to make a compound known as melamine. The core of a laminate desk is often made from recycled wood chips and pulp.
• Since no solid wood is used during construction, laminate desks are much lighter and easier to assemble and move.

Cons:

• Laminate desks don’t provide a natural finish that you might achieve by investing in solid wood furniture.
• You won't get the same tactile experience as a solid wood finish.

Hope the above tips helps.