Gel tabs are designed for those who want to wear the nails just for an evening/day out. They have a fantastic hold and can easily be removed by soaking in warm soapy water at the end of the day. The difference between the gel and the standard nail tabs is the gel is a slightly thicker pad but with a much stronger hold, the nail tabs are more of a form of double-sided tape. So mainly personal preference.
If you are looking to wear the nails for a longer period of time say a week or more we advise a good quality nail glue as it will have a much stronger hold.