In my opinion, these are the most beautiful serif fonts in the LaTeX Font Catalogue. All them are available in Adobe format (type1) and works well with pdfLaTeX. Read the manual for each one for more information about theirs characteristics.

Baskervald ADF:

\usepackage{baskervald}

Baskervaldx:

\usepackage{Baskervaldx} % Enhanced baskervald font

Libre Baskerville:

\usepackage{librebaskerville}

Baskervillef:

\usepackage{baskervillef} % Enhanced Libre Baskerville font

Libre Bodoni:

\usepackage{LibreBodoni}

Libre Caslon:

\usepackage{librecaslon}

Clara:

\usepackage{clara}

Crimson Pro:

\usepackage{CrimsonPro}
\let\oldnormalfont\normalfont
\def\normalfont{\oldnormalfont\mdseries}

Cochineal:

\usepackage{cochineal} % Enhanced Crimson Pro font

Domitian:

\usepackage{domitian} % Palatino "clon" font by Hermann Zapf (Adobe's version of Palatino)

Erewhon:

\usepackage{erewhon} % Based in Heuristica font (Heuristica is based in Utopia by Adobe)

ETbb (Edward Tufte's version of Bembo. Used in Beautiful Evidence and others books):

\usepackage{ETbb} % Enhanced fbb font

fbb:

\usepackage{fbb} %  Cardo "clon" font.

EB Garamond:

\usepackage{ebgaramond} % The most beautiful font in LaTeX! Actually my favorite font

Garamondx:

\usepackage[full]{textcomp}
\usepackage{garamondx} % Enhanced URW Garamond

Garamond Libre:

\usepackage{garamondlibre}

Heuristica:

\usepackage{heuristica} % Based in Utopia font by Adobe

Linux Libertine:

\usepackage{libertine} % My favorite font some years ago until I met EB Garamond font

Libertinus:

\usepackage{libertinus} % Fork of Linux Libertine

Stix2:

\usepackage{stix2} % Enhanced version of stix fonts designed by Tiro Typeworks for STI Pub Companies (AMS, AIP, APS, ACS, IEEE and Elsevier Science)

Utopia:

\usepackage[adobe-utopia]{mathdesign} % Designed by Adobe

Source Serif Pro:

\usepackage{sourceserifpro} % Designed by Adobe

IM Fell English:

\usepackage{imfellenglish} % Based in John Fell typefaces.

Spectral:

\usepackage{spectral} % Very clear font

Linguistics Pro:

\usepackage{linguisticspro} % Nice font.

In doubt:

\usepackage{merriweather}

\usepackage{OldStandardT1}
\usepackage{paratype}

\usepackage{PlayfairDisplay} % Use option 'black' to use the black

%% variant for boldface

%% Use option 'osf' to use oldstyle figures as default

\renewcommand*\oldstylenums[1]{{\playfairOsF #1}}

\usepackage[T1]{fontenc}

\usepackage[rm]{roboto}

\usepackage{XCharter}

Extra fonts (Ornaments):

\usepackage{adforn} % Arkandis Digital Foundry Ornaments
\usepackage{lettrine} % Capital Letter