There's A LOT of options out there. Things to consider are; weight, angle of inclination, capacity, how it connects to the tripod.
Because there's so many options on tripods in regards to the fulcrum/connection point, you almost need to know what you want before you buy. Some of it will mix and match and some won't. If it's a simple thread on connection, like a camera, then it should be pretty universal. If your tripod supports a bowl, the bowl size will matter. I've seen adapters and heard of people 'shimming' but this doesn't play well with me.
For example, I have the Innorel RT90C but wanted a specific RRS leveling head. I needed a TA-U-LC NOT a TA-2-LC. Basically the same but the TA-2-LC will attach in a bowl in place of the plate where the TA-U-LC attaches on top of the plate in the bowl. You may be able to attache the TA-2-LC on top, but not sure and I wanted the additional contact of the larger lower plate and security Allen head nut.
Hopefully you can see what I'm talking about by looking at the two pictures below.
This is a really sturdy yet light and very quick set up. The downside is angle of inclination. You can't get much angle up or down. Not really an issue unless you need some extreme angles. For that I'd suggest the Anvil 30 ball head. It seems to be the choice du jour but may be limited to what tripods it will work with due to how it attaches. Not sure because I haven't had one in hand to see. See third pic below.
I have a clone BH-55 that works very well. The Amazon reviews state it operates nearly the same as the RRS version but I doubt and hope it doesn't. It's fine for a <$200 ball head vs. the $500 RRS version (last pic). Their cons are weight and cost (RRS). The angles and panning or limitless. There are smaller versions too (BH-40 & 30). My personal recommendation would to be get the RRS first. I'd recommend either of the TA's, I just bought a TA-U, or the Anvil 30. I 'think' I shot off an Anvil 30 a few months ago and it was awesome. I was not familiar with it at the time and its sturdiness vs. its size was impressive.
It's really about budget and spending more on your tripod than rifle or scope is daunting. As I stated above, the RRS ball heads/leveling heads seem to sell quickly and for top dollar. But they are sub $500 and usually sub $300. The tripods are a different ball of wax. You're double to triple if not quadruple those numbers. Harder to find a buyer w/ the kind of money who just wouldn't rather spend a few extra hundred to get one new. When you're spending $1500 on a tripod you might prefer to not save $100. So I'd imagine you'd have to discount the tripod a bit more. That's just an assumption on my part though. I can tell you I've been very happy w/ my Innorel and I've talked to others who are also very pleased. Especially at the price.
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