Who to get with the Universal Elemental Condensate

I will use the universal elemental condensate to get one of the older characters since I already have an efridet at T4 and will keep summoning to se if I can get T6, with that in mind I was wondering which one between Estela Jaren and Helhest are the best at T0? From what Ive heard T1 is pretty important for helhest. And I am also more interested in jaren or estela since im missing a good solar 5* and also someone with either impact or rapid fire.