We make Photeria, so we're biased. We'd still rather you pick the right tool than switch for the wrong reasons, so here's the honest version.
Spiro and Photeria are closer than most. Both handle booking, scheduling, delivery, payments, property websites, and marketing for agents, and both charge per listing instead of a monthly plan. If Spiro works well for you today, that's a good place to be.
Where Photeria is different is how far you can take it. Property websites and marketing templates you can change section by section, templates that pick up each brokerage's colors, and workflows with your own triggers and conditions.