VB3 is still my favorite, but I am incorporating B5 in many more songs, now that it has become stable and the leslie was changed. I agree with Neil D that Blue3 has great sound engine, and I do use it in several songs. Here are some more thoughts:
VB3: Still a great organ and has stood the test of time. Very warm, great leslie emu, low cpu usage. Solid as a rock (as Neil said), and easy to tweak, even tho it’s great out of the box, and loads quickly. CON: apparently recent crash issues in Win 10 makes it less desirable. Also Guido at GSI has not updated this plug in several years. He did make a 64 bit version of the Win plug in recent years, but has abandoned further VST development, even tho he continues to upgrade it in his hardware, and it is killer! He has said recently that he intends to get back to the VST upgrades, but he has basically left it on it’s own for 7 years now.
B5: I love the open sound of this plug. It sounds as if you are really sitting at the real thing. Arno at Acoustic Samples has listened to his customers on this one, and continues to upgrade the plug. It is SOOOO much better than the 1st version. This one is good out of the box, but tweaking this one will really bring out it’s internal beauty. B5 is easily the top dog in the organ VST world, and has become my new mistress away from VB3. Having a developer this involved absolutely makes a huge difference. CON: B5 requires the UVI engine and ILOK. I despise ILOK because of their past practices. I will say that I have had very few issues with the newer ILOK, but occasionally, I will lose license confirmation on boot, and have to re-boot to get it back. It has not failed me during performance. B5 is partially sample based, so it can be a little slow in loading. It has been a little picky with the way it interacts with C3, but I have good control after discovering it’s needs.
Blue3: Great sounds! This one loads as fast as VB3. It has a newer synth look on GUI that took a little getting used to after years of organ pics, but I like it. Like any VSTi, it’s beauty is under the hood, and tweaking this one brings out it’s charm. Out of the box is good, but getting the sound you want is just a matter of spending the time. I have yet to discover everything with this plug, but am very impressed with it being so well thought out in early development. There has already been a few updates, so the developer is engaged, which is definitely a plus. CON: Could use more controls i.e. tuning and more leslie choices.
These 3 plugins are all great. I am finding that, now that there are more choices, I use which ever plug I think would be best in the particular song. VB3 is still the master. B5 is exciting and fun to play. Blue3 is the new kid with new surprises. They all work great live and rival the real thing in recordings. The software organ market left me dissatisfied for a long time. I spent 50 years behind the real thing, and these 3 are the only plugs that ever excited me enough to perform as if I were sitting at the keys of a real Hammond. The best is hard to determine, and is only in the ears of the individual.
My 2 cents