I vote for the Lee.
When I started shooting blackpowder cartridge rifle in 1997, I already had a Lee 4-lb. and a Lee 10-lb., but I bought a Lee 20-lb pot in order to handle the big bullet weights of 400 to 550 grains without running out of metal too fast.
I have used that Lee 20 lb pot on an average of once per week since then - that's about 500 casting sessions. The pot does drip a little, but it doesn't seem like it's any big deal. I never use the bottom pour feature, so I guess if it really bothered me, I could plug that bottom hole with a screw........but I've never gotten around to it.
One other thing to consider - if you really get into this, and decide to get a more expensive pot later, the other pot probably won't go to waste. I have my big pot filled with 20:1 alloy, another with linotype, and a third with wheelweights. It saves the hassle of continually having to empyt and then re-fill one pot with different types of alloy. The expense of three pots is not too much of a problem when they cost $35 to $60 each (Lee). But when they're $200 to $400 each...............
I do recommend one thing with the Lee (and probably with other pots too) - spend some of the money you saved by buying a Lee pot to get yourself a lead thermometer. RCBS and Lyman have them for about $20. Keep notes on what temperatures you need for casting with the different alloys with different bullet moulds.