I am in a bit of a helping mood and thought I would try to explain the differences.
Gatherbuddy is designed solely for the purpose of gathering herbs and minerals (and volatiles with engineering). It is well supported and does a fantastic job at gathering while flying. It has a few downsides in my opinion. #1 it does a fairly weak job of combat. It is all macro based and thus the logic is limited to what you can do in wow macros. Its not bad but you will get slaughtered by a passing elite or PVP battle. #2 it is a monthly subscription. Its only 5 euros if I recall correctly for a month after purchasing the app for 25 (correct me if I am wrong). In summary, Gatherbuddy collects herbs and minerals with a flying mount superbly and is well worth the cost whether it be for personal use (my preference) or gold selling.
Honorbuddy was originally designed as a leveling and PVP grinding bot. I can't speak much for the PVP aspect as I haven't tried it all that much. Honorbuddy is purchased in 1 year increments. It is currently limited in that you can not use flying mounts. The great thing about Honorbuddy is the plugin and class systems. If you peruse the forums you can find numerous classes which is to say a logic/rotation engine for your particular toon's spec. I.E. You can download a class that is specifically written for Demo locks, or for Enhance Shammies or what have you. For the most part they are all great (please note the default ones are pretty good too). Plugins are well.... plugins for the main program. They do extra things like train your new spells as you level, choose and equip quest rewards based on a predetermined stat weighting or even run instances for you (still have to baby sit this a bit still). Honorbuddy is totally worth it if you plan on leveling a toon or grinding out PVP.
GB/HB Lifetime is essentially the best of both worlds. You get 3 sessions (you can run a combo of GB or HB sessions on 3 toons at once). You also get access to the premium plugins and flying mounts. These are the plugins being developed that do some awesome things. The first is the use of Gatherbuddy in Honorbuddy. Now you can have the benefits of awesome combat engines while gathering mats. This means that your bot can run longer and with less supervision. You also get access to the Archeology Buddy plugin. This plugin makes your toon fly around the continent you are on gathering archeology artifacts and leveling up that profession. I've leveled up my main to 525 and have gotten several epics and novelty items. You also can access Auto Angler which will fly you around a given profile and fish in pools. This is awesome for getting achievements or for obtaining volatile water or cooking materials. A lot more plugins are always being developed and its starting to get to a very exciting phase.
If you have purchased either GB or HB you can apply the purchase price of either or both to your purchase of Lifetime. (You can't count the monthly subscription fee towards this.) You can post to the subforum listed below. I highly recommend this as everyone already has. I hope you enjoy.
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