SolrJ: SolrQuery and ModifiableSolrParams

[Cynthia Park]

Hello,

What is the difference between setting parameters via SolrQuery vs
ModifiableSolrParams? If there is a difference,  is there a preferred
choice?  I'm using Solr 4.6.1.

SolrQuery query = new SolrQuery();
query.setParam("wt", "json");

ModifiableSolrParams params = new ModifiableSolrParams();

params.set("wt", "json");