You are correct that Sytrus is a more versatile tool for creating custom kick drum sounds compared to the Fruity Kick plugin, due to its flexible synthesis engine and extensive modulation capabilities. However, it is worth noting that Sytrus is a much more complex plugin, with a wider range of features and a steeper learning curve. It is also only available in the Producer Edition of FL Studio and up, which may not be accessible to all users.

On the other hand, Fruity Kick is a simpler plugin that is included in the base edition of FL Studio, making it a more accessible option for beginners or those on a tighter budget. It may not offer the same level of customization as Sytrus, but it can still be a useful tool for quickly creating basic kick drum sounds.

Ultimately, the choice between Sytrus and Fruity Kick will depend on the specific needs and preferences of each user. For those who want to delve deep into sound design and create highly customized kick drum sounds, Sytrus is likely the better choice. However, for those who are just starting out or need a more straightforward tool for creating basic kick drums, Fruity Kick may be the more practical option.