Since you are asking in the Runescape Forums you're going to get biased answers. You'd be better posting in General Chat or the Donor Forums.
As for playing RS on Mobile, OG69Jelly plays exclusively on Mobile and he manages to do end game content so you shouldn't exclude yourself from that. I also personally believe OSRS functions extremely well on Mobile.
As for Albion, I have contemplated downloading it several times and always decided against it. Best advice I can give on that matter.