I been driving a few tanks in my days, remember I did my first service 79-80, when T62 was the top notch adversary.
the S-tank was a defensive tank in it's role, attacking with it needed terrain suited for the attack.
It was sitting along the highways to hit and run at full speed backwards to next position, it could turn with redicule speed when needed.
The later reincarnations of the tank offered better protection still, but was aging in it's role, mainly due to antitank helicopters becoming more effective, hitting vulnerable top of the tank- and expensive repairs.
The IKV91 was fast - 70km/h ( with higher turbo boost you could drive at about 90km/h) compared, had a comparably weak 90mm low pressure gun, aided with laser and computer guidance for shooting at range / things that moved. It used HEAT ammo, and HE.
It is a tank destroyer, weighs less than halt of the S-tank, the S-tank guys called it a antitank gun with rain cover
, it could travel pretty much everywhere with it's low bandpressure, where tanks at the time simply could not go.
You would be waiting hidden behind a slope looing down on attacking colums, on small roads - killing first and last vehicle, and call down artillery on the trapped force, and move to next location back.
The terrain in north of Sweden is to 95% covered with heavy woods, winter is normally from October to May, with smaller roads.
Below from a drill in 1982 , with me in the tank commander cuopla, driving trough woods.