For hand held tools, size isnt as important as handle and tool design.
If you're disabled, have arthritis or reduced grip consider ergonomic handle tools.
handle shape: tapering towards the tool head. goof for tools that you pull or draw back through the soil.
Tapering away from the tool head. good for pushing into the soil.
bright colored handles make it easier to see where you left it.
Dandelion weeder
Traditionally tools are straight because they're easier to make but new materials and manufacturing techniques allow new more comfortable designs
jobs
Spades and forks- the bigger the head the quicker the job will be done but each stroke will be heavier.
2 heights available 28 inch and 32 inch. choose to suit you.
flat bit for foot on head
solid forged carbon steel head
weatherproofed hardwood shaft