Now this is just bull••••. The only people that had control over that land were Bolshevik-sponsored NEPmen who engaged in a parasitic relationship with the peasantry, so much so that there was incredible strain on Soviet stability and peasant-state relations that only got repaired and rectified after the Second World War. No one, and I mean no one is free to the land under capitalism, just capital itself.
The collective system was more democratic, more stable, and gave peasants the largest say in governing the land than in any other period and by the late 1930s the damage was getting quickly overdone.
The entire motivation behind collectivisation was to increase party-state control over the peasantry in order to extract more grain from them to fund Stalin's crash industrialisation. This is well documented. Of course the rate of extraction exacerbated famine that killed millions of people.
Soviet agriculture was permanently crippled by collectivisation, to the extent that it was having to import American and Canadian grain in the 70s and 80s to avoid shortages. Inefficiency was such that the USSR had to spend upwards of 10% of its GDP on agriculture subsidies.