What can change the choice
A route name is a starting point, not a confirmation; weather, landing conditions, and pilot judgement can change the plan.
Standard and Riviera are the practical first comparison; Old Town and Sveti Stefan only make sense when that landmark is the reason.
Old Town and Sveti Stefan are seasonal, usually late October to late May; summer landing setup often changes the choice.
Participation fees describe operating-cost coverage, not a product ladder or guaranteed upgrade.
If you are unsure, send your date, group size, where you stay, and view priority before choosing.