In my opinion LTSpice does a great job here. When using general purpose (non-switching circuits optimized) SPICE simulators too often I incurred in convergence problems.
TINA is very good, I use the free TINA TI version from Texas Instruments, it has most TI models built in. Another simulator I am happy with is SIMetrix/SIMPLIS with very fast convergence. There is an free Intersil version of this software called iSimPE too.
I got the same question from users and I collected a small collection of the most common tools. You can find them here: www.dcdcselector.com/en/tools
The 3 mentioned ones are very popular, but also smaller manufacturers have some nice tools. Always depends which products are available within each tool.