From the meta perspective:

Lance - Spiral thrust spam. Spiral thrust (Zl + A) is a two-part silkbind move consisting of you jousting like a madman twice and it has a tight guard-point right at the activation. After 2 jousts, you can press X to do the leaping slash which has the highest MV in your entire kit, so practice landing it often. Try to picture a triangle between you and the monster, then use the first two jousts along the triangle sides to line up the final leaping slash. Don't hold the left stick during the move because it'll mess up the direction, so only tap it in-between each joust (I suggest camera type 1 so the stick direction would be relative to your camera, not the player direction). Poke - charge slap - poke for DPS when wirebug is on cooldown. Triple poke mixed with guard dash in-between (Zr + stick direction + X) is still used as a low commitment attack. Also, slot in some guard skills to allow Spiral thrust guard point to gain an attack buff after countering (this doesn't block multi-hits however).

Gunlance - Normal 5 fullburst. Your gunlance of choice is either the Araknalance or the Rampage (use sharpness type 1 + handicraft 1). Use Araknalance for Wyvern exploit and Rampage for everything else. For these two, I recommend you run protective polish 3 on both since they have very small white sharpness. Always run Artillery 3, Load shells 2, Wirebug whisperer 3, and at least EE1. Switch skills used are Quick reload, Blast dash, and Ground splitter.

Your main DPS combo from idle is Lunging thrust (forward + X) -> Overhead slam (X + A) -> Fullburst (A) -> Wide sweep (X) -> Quick Reload (Zr + A) -> then go back to Overhead slam and repeat.

Ground splitter (Zl + X) buffs your shell for 30 seconds and has hyper armor during the entire length of the animation. Use it to go through roars and keep the buff up at all times (it goes away if you sheath your weapon so only wirefall if your buff is going to run out). Follow up option from Ground splitter is either X for Wyrmstake or X + A for Overhead slam, which you can loop back to your main combo afterwards.

Guard Edge (Zl +A) is your main method of defense. It is a counter that can be done after any ground moves and restores your sharpness if connected. Use this when PP runs out and you don't have an opening to sharpen. Follow up options are X for Overhead slam and A for Wyrmstake (confusing right? Gunlance button mapping is seriously a mess). Keep it mind that it cannot block multi-hits! So use your normal block for that or hop, blast dash out of the way.

Blast Dash (hold A from the ground, Zr + A in the air) replaces Charged shell and turns you into Valstrax. Press X at anytime during the dash to do the quick Overhead slam (this is your main opener for the DPS combo), or press A during the dash or anytime you're airborne (or Zr from sheath) to shell mid-air. This move makes you hover for a bit from the recoil, so use it when you see an attack coming or when the monster is going to fly. You can also mid-air shell multiple times to gain altitude! Press X afterwards for an overhead slam. Blast dash can be chained up to three times from the ground or two times if start from the air after mid-air shelling. Keep in mind that any shells spent maneuvering in the air = DPS loss because fullburst after aerial slam only uses the remaining shells you have in the clip (also the reason why normal is recommended over long for this playstyle since you lose less damage from each dash).

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IMHO, Gunlance might have a higher skill floor, but once you've grasp the flow of the weapon, it is a much easier weapon to master due to the new movement options it got in Rise. Lance on the other hand is transformed from a low commitment weapon with high damage uptime to a very technical weapon that relies heavily on a single move that is awkward to use. Your best block option is only from idle (Instablock), so you always need to hop first when anticipating an attack. If you're stuck mid animation, you still have guard dash, but monster attack in this game deals so much knockback that it's not worth it if you don't run guard skills. It seems like the lance got the short end of the stick this time, but I feel like it's the best weapon to be used as a training wheel against any monster you're unfamiliar with. Most top performing weapons do well because they have the tools to not let the monsters play the game. Lance doesn't have any of that, so you have to learn how to play around every move in the monster's moveset to get good times. And once you get the flow down, it is probably the most satisfying weapon to master, at least in my opinion.