So lets start off with ranger. Here is a bunch of math....along with my summary...you have been warned. All testing below was done at 45 with a full 37 blue set and a +10 45 bow. None of the skills had sapphires spent on them and I did not use any non chain skills.
marksman 1YY = 224 + 317 + 358+ 346 + 201 + 192 + 181 + 205 + 203 + 414 + 178 + 202 + 223 = 3244/4 = 811 DPS
marksman 2RR = 766 + 1747 + 811 = 3324/3 = 1108 DPS
marksman 2TT = 904 + 398 + 2693 = 3995/5 = 799 DPS
marksman 3TT = 142 + 328 + 1050 = 1520/2 = 760 DPS
switch effect if maxed out would be a damage increase of 460 on our 2TT in snipe below
snipe 1RR = 2238 + 893 + 2907 = 6038/5 = 1207.6 DPS
snipe 2TT = 1920 + 319 + 5441 = 7680/5 = 1536 DPS
snipe 3RR = 60 + 344 + 573 + 57 + 52 + 568 + 1194 + 1163 + 444 + 446 + 561 + 595 + 52 = 6109/4.5 = 1357.5 DPS
rapid 2RR = 335 + 539 + 1932 = 2806 (the other abilities in this stance were so bad I didn't bother putting them here)
focused 1RR = 1108 + 694 + 476 + 561 + 533 + 564 + 497 + 479 + 523 = 5435/5 = 1087 DPS
focused 1YY = 562 + 991 + 727 = 2280/3 = 760 DPS
focused 2TT = 2286 + 425 + 1681 = 4392/5 = 878.4 DPS
focused 3YY = 822 + 1664 = 2486/2.50 = 994.4
focused switch effect wedge 317 DPS (3 ticks for 317)
bonus crit on switch wasted if you switch to snipe and do 2RR because of auto crit
wedge effect only triggers on crit so sometimes you see 0 benefit
if you don't skill into the increased concentration on switch it becomes very hard to use with snipe stance
Overall I think the best PVE combo is marksman + snipe using a combination of marksman 2RR + 1YY and snipe 2TT + 3RR.
For PVP it really depends what you are going for. You can pick people off with really high damage snipes using marksman + snipe, but if someone gets on you then your instant cast options arent as great,
or you can go marksman + focused and have the strongest DPS while moving with a backwards jump to help you kite, but you lose the big burst of a good auto crit snipe
For which non stance skills to use....they are all kind of quirky to use. You should take smoke bomb with party enhancement for sure since it is a big boost to your party's damage, dodge roll is also required to I frame certain boss mechanics and it is really good for removing CC in PVP. Steady concentration with the fighting power buff is really strong to use on a marksman 2RR when starting a chain in marksman so you likely want that for your 3rd slot.
For the last slot it really depends on what you are looking for:
- barrage with barrier II is useful for cheesing mechanics in PVE or getting some breathing room in PVP, but has a long cooldown
- Nerve wreck with nerve disturbance is a good possibility for PVP since it increases your damage and increases the stun duration to 3 seconds if you are being hit
- High angle fire stance snares you, but gives a flat always on damage boost depending on your range from the target. You can skill it to also increase the damage of people within 5m of you, but that causes you to take 20% more damage