Key difference: quota source
GNWL is in the general quota — the largest pool of seats. Cancellations from any general-quota passenger benefit the GNWL queue. TQWL is in the Tatkal quota — a small, premium-priced pool where passengers almost never cancel because they booked last-minute with a need.
Confirmation rate comparison
GNWL 1-10: 80-95% chance. GNWL 11-30: 38-80%. GNWL 31-50: 15-38%. TQWL 1: 15-25%. TQWL 2: 5-15%. TQWL 3+: less than 5%.
When you might have TQWL
TQWL appears when you booked a Tatkal ticket but Tatkal seats were already full. Even TQWL 1 rarely confirms because Tatkal passengers almost never cancel.
What to do
If you have GNWL below 30, track PNR and set alerts — there is a real chance. If you have TQWL of any number, book a backup immediately. TQWL almost never moves.