How to collect data in a form with ASP .NET Webforms?

I'm doing an ASP .NET Webforms form

When designing the form it is best to do it with HTML tags only or it must be done mixing the ASP Webforms object tools

In other words, for the form and the buttons I can do it in HTML:

<form id="pasoForm" action = "respuesta.html" method = "post" >
<input type = "submit" name = "boton1" id = "boton1" class ="ir-btn" />
</form>

Or using the ASP Standard objects

<form id="pasoForm" runat="server">
<asp:Button  runat="server" Text="boton1" ID="boton1"></asp:Button>
</form>


<form id="pasoForm" runat="server">
<button type="button" name="boton1" id="boton1" class="ir-btn" onclick="step1()">Continuar</button> 
</form>