choosing
v.v. picking one thing from a group because you want it more than the others. It is the act of making a decision between different options.
v. selecting a specific course of action or item from a set of available alternatives. The present participle of 'choose', often used to describe the ongoing process of decision-making.
I am choosing a blue shirt for the party.
After looking at several different menus, she is finally choosing what to order for dinner.
Carefully choosing a career path requires a balance between personal passion and the practical realities of the current labor market.
The verb is transitive and typically takes a direct object or a 'to' infinitive.
I am choosing of this oneI am choosing this oneChoosing is a transitive verb and does not require the preposition 'of' before the object.