I have Ares. He was my regular raid defense tank since the 3rd or 4th Q of 2018 obtained in some Atlantis portal when he was one of the featured heroes. I emblemed him high until he was stripped of it with the arrival of my Telluria in the 1st Q of 2020. The thing is, Ares barely sees action nowadays except as a second part of the ensemble of my 2nd monored team against green tanks in war where he is flanked by my 2 GMs and on wings are Grazul and 2ndWilbur/2nd Falcon. Against titan, i prefer using BT (for heal to all and attack up), Wilbur (for titan regular defense down), Falcon (for titan elemental defense down) and emblemed GM (my only 5* red hero with over 800 attack stat serving as my high attack stat hero). But you cannot discount his crit bonus to himself and nearby heroes. I always support him with my level 20 crit troop.
I also have Marjana, my latest vanilla S1 sniper acquired some few months back (or maybe late last year?). I left her at 3/70 even if I have enough ascension materials to get to final ascension 3 fire legendaries but plan to ascend her if I get her costume in the Masquerade portal when she is available. When I began playing, I am not really a fan of the sniper heroes by reason that I was endowed with heroes that hit 3 early on, i.e. Richard, Drake Fong, etc. But costumed Marjana will hit 3, as well as costumed Leonidas, on top of them being elemental defense down heroes.
Each player is on various points of the game and has a different set of heroes acquired, thus with different needs. I suggest placing both of them at 3/70 since they are decently usable at that level. Keep your rings for the moment, especially if you only have 6 rings. But if you have at least 12 of them, level the hero that will improve your roster and your teams. Only you can determine whether you need a red sniper or a utility hero. Also consider if you are a regular spender in the game that often access the summoning portal or not. As they say, the best hero is the one that you have as there is no point saving ascension materials if you are not summoning that much. This is very much applicable to free to play gamers. Even heavy spenders are not guaranteed to get the heroes they are chasing. So, that’s that.
EDIT: If you really want to ascend either hero, please read this: Before You Ascend, consider this: