I bought both but you will find that you will most likely use Pro the most.
Classic has an advantage in a some areas.
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1) It is stable (but no longer being updated.
2) It can create programs that will run better on older hardware.
3) There are fewer commands (but most commands are carried forward to Pro. There are changes to some of the parameters but basic syntax is very similar. Learn one, get a head start on the other.
DISADVANTAGE
1) You need the enhaced version to use add in DLLs to help with programming ,but the cost is inexpensive and it is also included with the the original DarkMatter.
2) The interface is not as easy to use as the proversion but there is a third party interface. I think it is still included with Classic.
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Pro has these advantages over Classic
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1) Pro is still being upgraded and improved.
2) Pro is faster
3) Pro uses more advanced technology in regards to 3D graphics support. This includes the use of shaders (which I am not using at this time).
4) Pro has a better interface as well as some third party interfaces for entering code.
5) Support for third party DLLs is built in. no expansion pack required.
6) There are a large number of add-ins or expansions (DLLs) available. Many are free from other users or low cost in some cases.
7) It cost only slightly more than classic (with DarkMatter)
DISADVANTAGES -------
1) It is in flux as upgrades, new features, and Bug fixs get implemented.
2) It is not as stable as Classic at this time, but it is much improved from the basic version. The current version upgrade level available is 5.8
3) It is slightly more expensive (but worth the extra cost.)
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You can create enjoyble games in either version.
Wasting CPU Cycles since the 286 was a hot machine.