What do you guys suggest, continue leveling relic weapon, or just try to get better weapon from somewhere else? I'm 3 books from finishing the upgrade to 110.
It'll take a while to catch up. If you're doing books, the finished weapon will actually be 100 (Atma is 100 with the stats of a 90, Animus is true 100).
I'd say that if you're really invested in your relic, do both: grab a Shiva weapon (110) and upgrade it (115), and keep doing your relic as something on the side. World of Darkness may also drop the item you need for an i120 weapon in future, and that in turn can be upgraded to 130 with Carbontwine. (This is written with the assumption that you are not doing Final Coil. Both items can be acquired there, and ultimately a 135 weapon for clearing it.)
On the other hand, if you just want a better weapon, it might not really be worth grinding a relic out now if you're not really into the grind - I think if you went in hard on it starting now, you'd be looking at like a month to get it up to date, and during that time, you'll have better weapon options all the way up to Zodiac.
Edit: It's also worth stating that it is a hell of a grind, and will take a lot of effort and resourcesbut hey, it can be something to do as a long term project! :V
And it is nice to have something like a personal weapon that feels like it's "yours". Whether that is worth your time and sanity is up to you.