Would large power armour or tankettes be superior for "medium/line infantry" support? The power armour is 10-12ft tall & weighs about 3-5 tonnes & has all round protection at STANAG 4569 level 3. While the tankettes are 4-10 ton small tracked vehicles, with all round protection equivalent to STANAG 4569 level 3 armour & frontal protection at somewhere in-between level 3 & 4. The weapons technology available to both of these is a bit in advance of modern day. The units that would use these exist in about a ratio of 1 platoon of these vehicles to every company of infantry.
The type of unit they're supporting (line infantry) isn't something that typically appears in modern day. The units are effectively infantry in lightly armoured trucks. These units don't have to worry about transportability that much, but cost is these units main reason for existence. They have support from light self propelled howitzers & AA Vehicles as well.
The primary opponents these would face are other well equipped militaries. The units they would be supporting aren't expected to perform quick maneuver & more to just hold the line. Sometimes they operate in counter-insurgency warfare but this isn't there primary intended use & units operating in that situation tend to be re-equipped for it but it would be nice to have it be able to be used in that situation.