Buy & sell direct online
The most professional and visually balanced way to write that phrase depends on how you intend to use it. Here are the three standard "proper" formats: buy & sell direct online
This feels more conversational and approachable, often used in subtext or explanatory sentences. Buy & sell direct online The most professional
Which of these fits the on your website or ad where you plan to place it? use the word "and."
Using the symbol is generally better for digital layouts because it saves space and creates a visual "anchor" between the two main actions. If the tone is very formal, use the word "and."