\[ a \left (x y'(x)-y(x)\right )^2-b x^2+x^2 y''(x)=0 \] ✓ Mathematica : cpu = 0.301902 (sec), leaf count = 134
\[\left \{\left \{y(x)\to x \left (c_2+\int _1^x\frac {i \sqrt {a} \sqrt {b} Y_1\left (-i \sqrt {a} \sqrt {b} K[2]\right )-i \sqrt {a} \sqrt {b} J_1\left (i \sqrt {a} \sqrt {b} K[2]\right ) c_1}{a \left (Y_0\left (-i \sqrt {a} \sqrt {b} K[2]\right )+J_0\left (i \sqrt {a} \sqrt {b} K[2]\right ) c_1\right ) K[2]}dK[2]\right )\right \}\right \}\] ✓ Maple : cpu = 0.211 (sec), leaf count = 72
\[ \left \{ y \left ( x \right ) = \left ( \int \!-{\frac {1}{ax}\sqrt {-ab} \left ( {\it \_C1}\,{{\sl Y}_{1}\left (\sqrt {-ab}x\right )}+{{\sl J}_{1}\left (\sqrt {-ab}x\right )} \right ) \left ( {\it \_C1}\,{{\sl Y}_{0}\left (\sqrt {-ab}x\right )}+{{\sl J}_{0}\left (\sqrt {-ab}x\right )} \right ) ^{-1}}\,{\rm d}x+{\it \_C2} \right ) x \right \} \]