Top row: 1st and 3rd logos
2nd row: 1st logo.
3rd row: 2nd logo.
The ones I've mentioned are the most visually pleasing.

Remeber when adding colors... (red & yellow) are considered colors of caution or danger depending on their image and how they are displayed.... The yellow logo stands out more as attention than caution on this occasion in my opinion. Hope my input helps.