The choices vary a lot, depending on many factors: whether you are a member, how much gold coins you are able (or willing) to spend, your combat style, etc.
In general, use the highest-level armour you are enabled to use, and you can afford. The ability to use armor depends on your defence level, not on your combat level. For example, you might use dragon if you have the level and can afford it, otherwise use rune, and if you can't wear that, adamant, next mithril, etc. Dragon requires a membership, the others are available for free-to-play.
However, if you are a member, you might also decide on using "pray against melee", in which case many monsters won't harm you at all. In this case, armour is practically useless for defense, and you can instead concentrate on using equipment that gives you a prayer bonus, for example the proselyte armour.
For magic or ranged combat, your best choices are, once again, different.
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skill levels of 70+ and a combat level of 90+
"Bandos is VERY good armor! >:)"However.... you must have65 defence in order to wear bandos and it takes forever to get enough money.Bandos' level is unknown for he is a runescape GOD.
Recommending monsters to kill is impossible without knowing your primary goal for killing (such as for experience or money) and your combat level. There are thousands of possible monsters to kill.
It is a good way to make money if you are good at it. It is not a particularly good way to gain experience points in combat compared to training on monsters, because you can only fight players who are fairly close to you in combat level (this is even more problematic if you are a strength pure and are fighting a balanced player or one with very high defense).
Armour is very important. It protects you when you are in battle.Depends on combat type. If somebody or something attacks you with magic, the armour will actually give you more damage instead of less. High-level armour is especially important if both you and anyone you attack use a melee attack. Different types of clothing give different attack and defense bonuses; check out the "equipment stats" for more details.