which the good one blue equipment or green equipment ?

[Insanity]

my class is Earth and Rune mastery , so which the best equipment blue or green color ?

[B l u e b e r r y P o p t a r t]

There is no "true" bis items, it comes down to your build and what stats and other stuff is on the gear for that character build. Typically green is better than blue but remember that some green items are going to be better than purple items too.

[sarcastic_godot]

Depends. There's a lot of crap in both categories. There are some great greens that become even greater with the right Charms or Relics (blue and purple rarity gear can't be "socketed"). Some Monster Infrequents (MIs - olive green stuff) can be absolutely awesome. There are a few great items in the blue rarity class. The piece of gear that plugs your resistance hole almost always is worth it.

Also, rarity isn't everything, neither is the listed level.

You really have to look at each item's stats.

[slayor3000]

Depends on your build a lot and how you are playing it.
Some blues and legendary items might suit but you will find a lot whose affixes bear no resemblance to how you want to build.

Green/ M.I you still need to find what suits your build best, but 1 they can be socketed (re-socketed if needed) and 2 a lot easier upgraded, an example is with a "Berserker" style Stonespeaker for the body I would be looking for "veteran" affixes which give "avoid" and "physical" resistance which goes great with "heat shields" 15% physical resistance. Along the way you can find better "veteran" gear with higher armour rating and/or better affixes.
This makes sticking to a build idea easier.

At the moment one toon(jugernaut level 36) is wearing Greaves of Pegasus which also give 15% movement and 20% elemental resistance, this is an upgrade from the pair before which had a lower armour rating and 15% elemental resistance.

How about + skills you are wandering.
Well "hallowed" helms give +1 and all the vitality resistance you need to begin with, in normal/ epic "farm" (hate farming) for "crystal of erebus" +1 skills to Helm, in Legendary +2 skills.

[chris.ferrantegerard]

Technically item ranks go as follows Purple > Blue > Monster Infrequent (I'm ranking them above greens because they get base stats for the MI in addition to fixes) > Greens > Yellows > White.

Whites are only good for first few levels and yellows become vendor trash pretty soon as well.

From a practical standpoint, this depends on the items in question. The best equipment is the one that provides the most benefit. A monster infrequent / green with good fixes + charm / relic can be better than a Purple or Blue. Green weapons with good fixes with a charm / relic are often much better for leveling. Don't rank just by colour but item usuablility.