Tithe does not require that the 4 followers be in the same city. One of Tithe's main advantages is that random numbers of followers in your cities (9 followers here and 11 followers there) and in other cities where your religion is not in the majority (1 follower here, 2 followers there, etc.) add up to large numbers, and get aggregated for purposes of the bonus.
The three gold-giving founder beliefs all have their advantages. Initiation Rights gives you 100 gold when a city first converts (equal to 50 turns of Church Property), but nothing thereafter, so it is best when you want/need that upfront gold (perhaps to rush-buy more settlers, units or science/culture buildings) and have something else coming along (like trade routes, TP spam and Machu Piccu?) that will get you replacement gpt in the mid and late game. It is also helpful if you find yourself coming late to the religion party; if other civs religions are already well-entrenched with high pressures when you are able to found your religion, you might take Initiation Rights with the intention of spamming out Great Prophets to convert nearby cities, recognizing that they will probably convert back before you get 50 turns of Church Property benefits (in fact, in those circumstances, that might be a better use for your second Great Prophet than enhancing your religion).
Church Property does usually provide more gold during the earlier part of the game, but it is limited to cities in which your religion is in the majority and (obviously) is capped at 2 gold per city. So, Church Property over-rewards for small pop cities, which is great for as long as that lasts, but doesn't scale over time. I find that by the time my religion is in 15-20+ cities, Tithe (particularly with Itinerant Preachers) has often outstripped what Church Property would have provided. In general, Tithe should provide the most gold over the course of the game, but more back-loaded than Church Property and far more back-loaded than Initiation Rights. Timing of gold can be as important as the amount.