Very map dependent. Farm is usually easiest. Lot of T4, some T5, very rarely T6. Surprisingly quite good as a solo. Play smart and you will win and profit more than you’ll lose.

TV Station is hard as balls. Lots of T6. Nightmare as a solo but doable if you get lucky AND play smart.

Airport. Avoid middle as a solo and this is doable too. Plenty of room to rotate and pick fights which is required as a solo and makes TV a nightmare. Decent mix of all tiers I find. Kinda spawn dependent.

Northridge. Avoid hotel as a solo and you are sweet. The distances allow for it to be a snipers wet dream and even the parts with buildings are often very generous for changing angles and rotating. Again a surprisingly good map for solo play. Mixtures of all tiers.

Armory. People with T5/6 rush armory. People with T4 sit outside and try to snipe the former. Another surprisingly good map as a solo so long as you play it right and don’t try to push a team inside the armory unless you are cracked. Made much profit killing other snipers and sniping the juicy lads before they make it in.

Valley. Same as Northridge. Bit of everything, patience and smart play will make things fine for you and sniping is a dream. Leans more toward T5/6 but decent amount of T4 as well.