  We study the detection accuracy of double white dwarfs (DWDs), stellar-mass
black hole binaries (SBHBs), light and heavy intermediate mass ratio inspirals
(IMRIs), extreme mass ratio inspirals (EMRIs), massive black hole binaries
(MBHBs), and the stochastic gravitational wave background (SGWB) of
astronomical origin for TianQin, LISA, and joint detection. We use a Fisher
matrix analysis and consider for each source the averaged detection accuracy
over a realistic range of parameters. We find that on average TianQin obtains
more accurate parameter estimation for DWDs and light IMRIs, LISA for heavy
IMRIs, EMRIs, MBHBs, and the galactic foreground of the SGWB, and both
contribute similarly to the detection of SBHBs and the extra-galactic SGWB.
Nevertheless, for all sources joint detection allows setting tighter
constraints on most parameters highlighting its importance for future
detection.
