Some of the melting pots have a built in PID which provides very precise digital temperature control, the cheaper melters are just a dial with numbers, you use a thermometer clipped to the side to monitor and turn the knob to get the desired temp. Has more of a temperature curve as the pot drains. Doesn't cause too much trouble for most folks (I just remember where I set the dial for what lead and mold) but lead temperature is one more variable and a PID makes it so you can just set it and forget it. An external PID that a regular pot plugs into so that the power is controlled by the PID costs around $100 give or take when made by a hobbyist and sold in swapping and selling, so you can figure they add at least that much or more to the price of the pot when they are built in.
I don't use a bottom pour, I use a Lyman "Little Dipper" ladle to pour my lead into the mold. It is slower than bottom pour I'm sure but I like the way I can see my pour and adjust how the lead flows in to suite the molds preferences. Straight down the center, over the edge, or sort of a side swirl. Since I am pouring over the pot I can also pour a little from the ladle onto the sides of the mold to help keep the temp of the mold higher if needed. http://www.midwayusa.com/product/286...an-lead-dipper Also tip the mold to the spout and turn them together to "pressure cast" for some long rifle bullets that like that.
Not saying better but I decided for the money I could get a larger Lee pot without the bottom pour and what can I say I enjoy it. Feeding an auto loader with .223 or 7.62 Russian takes longer than it does with bottom pour but I do batches of 250 - 1000 at a time sitting on a stool and am contented with the speed. Like this video (same ladle but I don't use a mallet) This person is somewhat pressure casting, watch how the mold is tipped and fitted to the ladle spout and then tipped together so the lead goes in under a bit of pressure from the spout. https://www.youtube.com/watch?v=GgRq6yVml5E