Is it better to pre-order tickets for the Sanctuary of Truth online or buy them on site?

This year, we, as a family of four, want to visit the Sanctuary of Truth in Pattaya, Thailand. Many third-party providers (e.g., getyourguide, klook, etc.) offer tickets, but they are, of course, time-limited, and they always state "Your voucher must be exchanged at the ticket counter before the tour." So you have to wait in…