Should I buy the high-yield TN-760 cartridge for the Brother HL-L2460DW instead of using the starter TN-730?

Yes, spring for the TN-760. The HL-L2460DW ships with a starter TN-730 that only lasts about 1,200 pages, while the TN-760 gives you roughly 3,000 pages. The cost-per-page difference is significant enough that the TN-760 pays for itself before the first replacement.