M-20 pilot reported an NMAC while on descent. Approach Control gave the pilot an alert regarding the traffic as did the pilot's EFB. The pilot became uncomfortable with the spacing of the traffic and took evasive action. ATC ask the pilot to call when able for a debriefing and their need for information.

Narrative

I was on an IFR flight plan approaching ZZZ Class B for ZZZ1.ZZZ Approach begins descent.ZZZ Approach says turn 10 degrees right for traffic avoidance. I complied.A few minutes later Approach says 25 degrees right for traffic. I complied.Continuing descent per ATC direction.Altitude approximately 3800 ft. per EFB.Cockpit traffic system indicates 'traffic 9 o'clock 1 mile'. ADSB traffic display indicates -200 ft. below my present altitude.Approach Controller asks if I can see the traffic and notifies traffic is approaching.I attempt a visual on the traffic; but unable to see the traffic.In-cockpit ADSB traffic system indicates the other plane is very close and -200 ft. below.At this point I am uncomfortable with the safety margins of the closing aircraft separation or lack of separation. I did not [request priority handling] due to time constraints of a rapidly evolving situation. In hindsight I wish I had [requested priority handling]. I immediately halted my descent and initiated a right partial clearing turn in VMC; and cleared traffic above me visually and on ADSB traffic display. I initiated an emergency aggressive climb to increase traffic separation while notifying ATC controller by radio. I continued to climb until ADSB traffic indicated approximately 1000 ft. vertical separation from threatening target. Then I was able to get a positive visual on the other airplane as it crossed behind my tail.When I landed; ATC asked me to call and speak with a supervisor. I was told 'you are not in trouble; they just need some information.' I made the call and had a pleasant conversation with an ATC Supervisor. He asked me some questions regarding the traffic separation and my evasive climb and that was it.