  Gravitational waves (GWs) produced by sound waves in the primordial plasma
during a strong first-order phase transition in the early Universe are going to
be a main target of the upcoming Laser Interferometer Space Antenna (LISA)
experiment. In this short note, I draw a global picture of LISA's expected
sensitivity to this type of GW signal, based on the concept of peak-integrated
sensitivity curves (PISCs) recently introduced in [1909.11356, 2002.04615]. In
particular, I use LISA's PISC to perform a systematic comparison of several
thousands of benchmark points in ten different particle physics models in a
compact fashion. The presented analysis (i) retains the complete information on
the optimal signal-to-noise ratio, (ii) allows for different power-law indices
describing the spectral shape of the signal, (iii) accounts for galactic
confusion noise from compact binaries, and (iv) exhibits the dependence of the
expected sensitivity on the collected amount of data. An important outcome of
this analysis is that, for the considered set of models, galactic confusion
noise typically reduces the number of observable scenarios by roughly a factor
two, more or less independent of the observing time. The numerical results
presented in this paper are also available on Zenodo
[http://doi.org/10.5281/zenodo.3837877].
