Bang for Buck, you can't beat Radial. The link below will help you understand the differences between passive and active DI Boxes.
https://www.radialeng.com/comparing-direct-boxes
I have The JDI passive, the Duplex JDI passive the D2 Pro passive and the J48 Active as well and a host of other makes of DI Boxes, and for my money the favourite is the Radial. I hope to buy several more of them for various reasons. If you are serious about recording at some time you will probably need both passive and active eventually. Its difficult to go wrong here.
There are times when, (although I have the much more expensive Duplex), I have found the cheaper D2 Pro Di to be the better solution altogether in sound. This is surprising to me at least, but true. It's important to have "ears" to appreciate this point. To be an intensely good listener. (A very rare commodity). Its not about money, it’s about listening, they have different frequency responses and transformers.
So don't think expensive is necessary, both are good, and Radial make a stereo JDI cheaper than the Duplex. (but, with less options, I like options), you will do well with any of these DI’s. In my experience, the only keyboard I have encountered that needed an active DI was old Fender Rhodes, but check the specification of your instruments to see their output impedance to help you decide what you need. (Do your homework).
Lastly, and I write this for the general benefit of everyone, virtually all the people I have met that use keyboards think the best thing to do is to plug the output of the keyboard into the mixer or recording interface. That a DI box is not necessary at all. I have great sympathy with this view and understand their thinking.
However, although Mellotrons have been the most problematic keyboards for me in recording studios, I have known faults on mixing consoles blow keyboard main boards, and faults on keyboards blow mixers and recording interfaces. Such things happen very rarely, but they do happen and that is an additional good reason for using a D.I where you might easily think you don't need one.
Finally, if you could turn the gain up enough, you would find that many such instruments (like Microphones) have a certain level of self noise. This can be extremely difficult to hear, but I've found it to be the case. A DI can get rid of that noise, if it has a really good transformer. To that end also, sometimes the DI with a narrower frequency response, can be the best option because that can eliminate certain types of noise.