Which do you prefer (which are easier for transition?) and why??
Our TTC Journey
TTC #1: May 2011
BFP: 10/27/2011 | EDD: 6/30/12
DS born 6/28/12 via C/S
TTC #2: September 2018
Me: 36 | DH: 39
Mirena removed 9/13/2018 after 6 years
BFP 11/11/2018 | MC @ 5.5 weeks on Thanksgiving
July 2019 - Diagnosed with Secondary Unexplained IF
August 2019 - 2.5 mg of Letrozole = Never Ovulated so Trigger and IUI were cancelled
9/30/2019 - IUI #1 (5 mg of Letrozole + Trigger) = BFP but Betas showed CP @ 4 weeks
10/28/2019 - IUI #2 (7.5mg of Letrozole + Trigger) = BFN
11/25/2019 - IUI #3 (7.5mg of Letrozole, Trigger + Crinone after IUI) = BFN
12/24/2019 - IUI #4 (7.5mg of Letrozole + Crinone after IUI) = BFN
1/24/2020 - IUI #5 (50mg of Clomid + Trigger + Crinone after IUI) = BFN and an Ovarian Cyst
3/2/2020 - Taking a break to reset/NTNP
11/1/2020 - At peace with where things are in life and are no long actively TTC. Whatever happens will happen and it will all be okay.

Re: Straw or sippy cup??
We've never used a sippy cup, but DD loves her straw cups. She gets a litte confused because she tries to tip the cup back, so we have to remind her to hold it down to sip out of
She also just likes to drink out of a regular cup. We just hold it for her.
We use both but my kids seem to prefer the straws. My toddler generally uses an open cup now but we still use the straw/sippys for on the go.
There are some theories out there that traditional hard spout sippy cups can cause dental and speech problems. I don't know if I believe that but since they like the straws we'll go that way anyway.
The only con to straws are they can be a pain to wash and easy to lose (our garbage disposal has claimed a few already)
DD drinks from a sippy or a regular cup. We used Tommee Tippee bottles, and they make a starter sippy cup, which she has used since about 7-8 months. We also use the Take & Toss sippies.
Straw cups are actually better for their teeth (the drink doesn't touch their teeth much because it goes further back in their mouth). DD only drinks water, so it doesn't matter. I have always tried to stick with straw cups or regular cups for DS's milk.