I wouldn't say it is viable to play both, not just because you can't log into both but also since you're likely to be copying a lot of content twice in the RS gold event that you do that. I would proceed with RS3, if you're after something less grindy but that is totally up to you. Members makes a huge difference on both matches, f2p is more or less a trial then associates makes Runescape 10x larger with more to perform - quests, supervisors, new skills, faster ways to train/make cash.
I would say spend a while creating your match layout easy to use. Once you get into bossing the skills start becoming mandatory to use at certain times but before then you can just use revolution+(click creature, mechanically use abilities).
If you want to play RS3 and OSRS you need to! I play equally and thoroughly enjoy both in various ways, they both have a great experience to provide in various areas. Just play whats most entertaining for you. That's good to hear! What are some for? I just discovered I can have something known as an"ore box" at RS3. Also, I managed to mild logs without a tinderbox, chop wood with no hatchet, fish with no cagemine without a pickaxe! I'm so confused how I am doing everything lol, Runescape from 2010 is just ingrained in my thoughts.
All of that stuff is going to be on your tool belt - that you'll need to update from bronze up to the highest tools and could be viewed from the equipment tab. Runescape from 2010 is similar to oldschool concerning mechanic, combat, skilling shrewd, only older graphics plus they publish their own special content. RS3 battle and interfacr process is far more complicated and I reccomend watching a"getting into RS3" video, as well as videos on action bars, and port set ups once you begin with battle. The wiki will be definetly your friend for abilities quests etc.
I'm pretty good about skills and quests. There is autocasting the abilities, you will find hotkeys for the abilities.combine that with buttons and cheap OSRS gold activity bar switches, and I think the only MMO I have played with a more complex battle system is GW2.I'll need to find some seriously excellent advice on EOC. My preconceptions of Runescape are going to be tough to conquer though. So much time in the original F2P Runescape.it makes me want to perform with the exact same way I played with that, and I know I can not (and should not!) Do that.